Questions on Algebra: Linear Equations, Graphs, Slope answered by real tutors!

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Question 223: 2x+ y+ 3z=1
2x+6y+ 8z=3
6x+8y+18z=5

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Question 179: how do u slove linear systems by graphing?
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Question 178: solve the following x+2/4=x-2/2
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Question 176: this isn't really a questions but i have to ask i had a test last week on linear equations right and i thought i would do alrite in it but i didn't to my horror i actually did really bad please can u try and help me understand it more better

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Question 157: Hi
ok i have no idea how to do scientific notations and i was wondering if there was a site i could go to anyways
if u have to rewrite in decimal form
96.3 it would be 9.63 x 10 to the 1 power
and if it is .oooo987 it would be 9.87 x 10 to the 5th power
am i right??

Click here to see answer by ikleyn(54061) About Me 
Question 157: Hi
ok i have no idea how to do scientific notations and i was wondering if there was a site i could go to anyways
if u have to rewrite in decimal form
96.3 it would be 9.63 x 10 to the 1 power
and if it is .oooo987 it would be 9.87 x 10 to the 5th power
am i right??

Click here to see answer by timofer(161) About Me 
Question 157: Hi
ok i have no idea how to do scientific notations and i was wondering if there was a site i could go to anyways
if u have to rewrite in decimal form
96.3 it would be 9.63 x 10 to the 1 power
and if it is .oooo987 it would be 9.87 x 10 to the 5th power
am i right??

Click here to see answer by KMST(5484) About Me 

Question 153: (4,10)
9x-y>or equal 23
5x+0.2>or equal 20
it says solve by graphing

ok i do not get one single thing about systems of linear inequalities
this question is a pain

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Question 146: When solving a linear system using linear combinations, is there a right way to multiply both equations to get opposite variables?
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Question 145: 1. Solve the equation: 2x^3 + 6x= 8x^2
2. Explain why it is incorrect to solve the equation (y-2) (y+2) =4 by setting y-2=2 and y+2=2 and solving the resulting equations.
Thank you in advance.

Click here to see answer by MathTherapy(10897) About Me 
Question 145: 1. Solve the equation: 2x^3 + 6x= 8x^2
2. Explain why it is incorrect to solve the equation (y-2) (y+2) =4 by setting y-2=2 and y+2=2 and solving the resulting equations.
Thank you in advance.

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Question 74: Find the slope and y-intercept of the graph of each equation for:
%282%2F3%29%2Ax+%2B+%281%2F6%29%2Ay+=2

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Question 997457: what is x-intercept of the line passing through points (-4,15) and having a slope of -1?
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Question 53074: 2x>5x+18 the great sign is great or equal to
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Question 60613: The sum of two numbers is 33. Their difference is 9. What are the two numbers? This is how I solved am I right if not what did I do wrong?
x+9=33
y-9=33
24+9=33
42-9=33

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Question 1106092: Paul can do a certain job in half the time that Jim requires to do it. Jim orked alone for an hour and stopped, then Paul complete d the job in 10 hours. What length of time, in hours, woul d Paul, working alone, take to do the whole job?
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Question 1155051: What is the slope of a line perpendicular to the line whose equation is 12x-9y=135 fully reduce your answer
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Question 1155610: Given the points ( 4, -3) and ( 2, 2) answer the following.
a. Find the slope of the line, L1, that goes through the points ( 4, -3) and ( 2, 2).
b. Write the equation of the line, L1. Write in slope intercept form.
c. Find the slope of the line, L2, that is perpendicular to L1.
d. Write the equation of the line, L2, that goes through the point ( -3, 5 ).

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Question 1176815: A motorboat travels 165 kilometers in 3 hours going upstream. It travels 207 kilometers going downstream in the same amount of time. What is the rate of the boat in still water and what is the rate of the current?
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Question 1176815: A motorboat travels 165 kilometers in 3 hours going upstream. It travels 207 kilometers going downstream in the same amount of time. What is the rate of the boat in still water and what is the rate of the current?
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Question 1161742: please can help me
thanks
“A frigid Florida winter is taking its toll on your sandwich. The sunshine state is the main U.S. source for fresh winter tomatoes, and its growers lost some 70 percent of their crop during January’s prolonged cold weather. The average wholesale price for a 25-pound box of tomatoes is now $30, up from $6.50 a year ago. Florida’s growers would normally ship about 25 million pounds of tomatoes a week; right now, they are shipping less than a quarter (8million). High demand has driven up prices and wholesalers are buying from Mexico. Based on that, some restaurants provided tomatoes only on request.”
a. Using the information above find the demand and supply curves in the market for winter tomatoes.
b. Calculate the price elasticity of demand for winter tomatoes as well as elasticity of supply using the midpoint method.

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Question 1210547: Solve This Graphically 3x+y=2
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Question 1210547: Solve This Graphically 3x+y=2
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Question 1182886: WRITE THE EQUATION OF THE LINE PARALLEL TO 4X-5Y-10=0 THAT PASSES THROUGH (0,-3).
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Question 1182886: WRITE THE EQUATION OF THE LINE PARALLEL TO 4X-5Y-10=0 THAT PASSES THROUGH (0,-3).
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Question 1182886: WRITE THE EQUATION OF THE LINE PARALLEL TO 4X-5Y-10=0 THAT PASSES THROUGH (0,-3).
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Question 1164762: If a stock price goes from $10 to $12 from January 1st to January 31, from $12 to $9 from February 1st to February 28th, and from $9 to $15 from March 1st to March 31th is the price change from $10 to $15 a straight line?
It is clear that in each of the three time intervals mentioned there was a complex daily variation of prices as in an electrocardiogram. But what would be a simplified solution for a first naive view of the situation? Would a simple function hold up? What is the simplest function to represent this situation? Does your naïve initial and simplified model allow you to predict the behavior of the stock in the next month?
How can I use three “pieces” of lines to describe the price movements from the beginning of January to the end of March? Show the graph for the price movement.

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Question 1204563: Write an equation of the line that passes through the pair of points.
(−2, −3), (4, 5)

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Question 455145: find the slope of a line perpendicular to the line that passes through 3 9 and 7 15
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Question 453353: what is the slope-intercept of 2x-7y=-24 passing through (9,11)
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Question 448805: graph the line that goes through point (3,8) and is parallel to the line whose equation is 6y-10x=30
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Question 448767: Write an equation of the line containing the given point and parallel to the given line. Express your answer in the form y=mx+b.
(8,9); x+7y=2
y=

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Question 447764: Given the linear equation y=-7/4x-1, find the y-coordinates of the points (-4, ), (0 ), and (4, ). Please show all of your work. Plot those points and graph the linear equation.
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Question 447764: Given the linear equation y=-7/4x-1, find the y-coordinates of the points (-4, ), (0 ), and (4, ). Please show all of your work. Plot those points and graph the linear equation.
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Question 448477: Find the slope of the line that contains the points 9,8 and -2,1
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Question 444813: I need to find the equation of the line containg (-2, -7) and (-5, -8)
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Question 428573: What is the equation of the line, in standard form, that passes through (4, -3) and is parallel to the line whose equation is 4x + y - 2 = 0?
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Question 430695: write and equation of the line containing the points (3,-1) and is parallel to 8x-7y=9
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Question 430695: write and equation of the line containing the points (3,-1) and is parallel to 8x-7y=9
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Question 431238: which equation represents a line that passes through the points (2,3) and (-1, -3)?
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Question 431238: which equation represents a line that passes through the points (2,3) and (-1, -3)?
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Question 431339: how do u find the midpoint of the line segment of (10,-10),(9,-9)?

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Question 428471: I need to use substitution method
15x-10y=1
5y=-2+15x

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Question 428476: Flying from Tokyo to London is approximately 6175 miles. On the way to London from Tokyo(against the wind) the flight took 13 hours. the return flight (with the wind) took 9.88 hours. Find the speed of the plane in still air and the speed of the wind current.
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Question 428476: Flying from Tokyo to London is approximately 6175 miles. On the way to London from Tokyo(against the wind) the flight took 13 hours. the return flight (with the wind) took 9.88 hours. Find the speed of the plane in still air and the speed of the wind current.
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Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 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7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190, 8191..8235, 8236..8280, 8281..8325, 8326..8370, 8371..8415, 8416..8460, 8461..8505, 8506..8550, 8551..8595, 8596..8640, 8641..8685, 8686..8730, 8731..8775, 8776..8820, 8821..8865, 8866..8910, 8911..8955, 8956..9000, 9001..9045, 9046..9090, 9091..9135, 9136..9180, 9181..9225, 9226..9270, 9271..9315, 9316..9360, 9361..9405, 9406..9450, 9451..9495, 9496..9540, 9541..9585, 9586..9630, 9631..9675, 9676..9720, 9721..9765, 9766..9810, 9811..9855, 9856..9900, 9901..9945, 9946..9990, 9991..10035, 10036..10080, 10081..10125, 10126..10170, 10171..10215, 10216..10260, 10261..10305, 10306..10350, 10351..10395, 10396..10440, 10441..10485, 10486..10530, 10531..10575, 10576..10620, 10621..10665, 10666..10710, 10711..10755, 10756..10800, 10801..10845, 10846..10890, 10891..10935, 10936..10980, 10981..11025, 11026..11070, 11071..11115, 11116..11160, 11161..11205, 11206..11250, 11251..11295, 11296..11340, 11341..11385, 11386..11430, 11431..11475, 11476..11520, 11521..11565, 11566..11610, 11611..11655, 11656..11700, 11701..11745, 11746..11790, 11791..11835, 11836..11880, 11881..11925, 11926..11970, 11971..12015, 12016..12060, 12061..12105, 12106..12150, 12151..12195, 12196..12240, 12241..12285, 12286..12330, 12331..12375, 12376..12420, 12421..12465, 12466..12510, 12511..12555, 12556..12600, 12601..12645, 12646..12690, 12691..12735, 12736..12780, 12781..12825, 12826..12870, 12871..12915, 12916..12960, 12961..13005, 13006..13050, 13051..13095, 13096..13140, 13141..13185, 13186..13230, 13231..13275, 13276..13320, 13321..13365, 13366..13410, 13411..13455, 13456..13500, 13501..13545, 13546..13590, 13591..13635, 13636..13680, 13681..13725, 13726..13770, 13771..13815, 13816..13860, 13861..13905, 13906..13950, 13951..13995, 13996..14040, 14041..14085, 14086..14130, 14131..14175, 14176..14220, 14221..14265, 14266..14310, 14311..14355, 14356..14400, 14401..14445, 14446..14490, 14491..14535, 14536..14580, 14581..14625, 14626..14670, 14671..14715, 14716..14760, 14761..14805, 14806..14850, 14851..14895, 14896..14940, 14941..14985, 14986..15030, 15031..15075, 15076..15120, 15121..15165, 15166..15210, 15211..15255, 15256..15300, 15301..15345, 15346..15390, 15391..15435, 15436..15480, 15481..15525, 15526..15570, 15571..15615, 15616..15660, 15661..15705, 15706..15750, 15751..15795, 15796..15840, 15841..15885, 15886..15930, 15931..15975, 15976..16020, 16021..16065, 16066..16110, 16111..16155, 16156..16200, 16201..16245, 16246..16290, 16291..16335, 16336..16380, 16381..16425, 16426..16470, 16471..16515, 16516..16560, 16561..16605, 16606..16650, 16651..16695, 16696..16740, 16741..16785, 16786..16830, 16831..16875, 16876..16920, 16921..16965, 16966..17010, 17011..17055, 17056..17100, 17101..17145, 17146..17190, 17191..17235, 17236..17280, 17281..17325, 17326..17370, 17371..17415, 17416..17460, 17461..17505, 17506..17550, 17551..17595, 17596..17640, 17641..17685, 17686..17730, 17731..17775, 17776..17820, 17821..17865, 17866..17910, 17911..17955, 17956..18000, 18001..18045, 18046..18090, 18091..18135, 18136..18180, 18181..18225, 18226..18270, 18271..18315, 18316..18360, 18361..18405, 18406..18450, 18451..18495, 18496..18540, 18541..18585, 18586..18630, 18631..18675, 18676..18720, 18721..18765, 18766..18810, 18811..18855, 18856..18900, 18901..18945, 18946..18990, 18991..19035, 19036..19080, 19081..19125, 19126..19170, 19171..19215, 19216..19260, 19261..19305, 19306..19350, 19351..19395, 19396..19440, 19441..19485, 19486..19530, 19531..19575, 19576..19620, 19621..19665, 19666..19710, 19711..19755, 19756..19800, 19801..19845, 19846..19890, 19891..19935, 19936..19980, 19981..20025, 20026..20070, 20071..20115, 20116..20160, 20161..20205, 20206..20250, 20251..20295, 20296..20340, 20341..20385, 20386..20430, 20431..20475, 20476..20520, 20521..20565, 20566..20610, 20611..20655, 20656..20700, 20701..20745, 20746..20790, 20791..20835, 20836..20880, 20881..20925, 20926..20970, 20971..21015, 21016..21060, 21061..21105, 21106..21150, 21151..21195, 21196..21240, 21241..21285, 21286..21330, 21331..21375, 21376..21420, 21421..21465, 21466..21510, 21511..21555, 21556..21600, 21601..21645, 21646..21690, 21691..21735, 21736..21780, 21781..21825, 21826..21870, 21871..21915, 21916..21960, 21961..22005, 22006..22050, 22051..22095, 22096..22140, 22141..22185, 22186..22230, 22231..22275, 22276..22320, 22321..22365, 22366..22410, 22411..22455, 22456..22500, 22501..22545, 22546..22590, 22591..22635, 22636..22680, 22681..22725, 22726..22770, 22771..22815, 22816..22860, 22861..22905, 22906..22950, 22951..22995, 22996..23040, 23041..23085, 23086..23130, 23131..23175, 23176..23220, 23221..23265, 23266..23310, 23311..23355, 23356..23400, 23401..23445, 23446..23490, 23491..23535, 23536..23580, 23581..23625, 23626..23670, 23671..23715, 23716..23760, 23761..23805, 23806..23850, 23851..23895, 23896..23940, 23941..23985, 23986..24030, 24031..24075, 24076..24120, 24121..24165, 24166..24210, 24211..24255, 24256..24300, 24301..24345, 24346..24390, 24391..24435, 24436..24480, 24481..24525, 24526..24570, 24571..24615, 24616..24660, 24661..24705, 24706..24750, 24751..24795, 24796..24840, 24841..24885, 24886..24930, 24931..24975, 24976..25020, 25021..25065, 25066..25110, 25111..25155, 25156..25200, 25201..25245, 25246..25290, 25291..25335, 25336..25380, 25381..25425, 25426..25470, 25471..25515, 25516..25560, 25561..25605, 25606..25650, 25651..25695, 25696..25740, 25741..25785, 25786..25830, 25831..25875, 25876..25920, 25921..25965, 25966..26010, 26011..26055, 26056..26100, 26101..26145, 26146..26190, 26191..26235, 26236..26280, 26281..26325, 26326..26370, 26371..26415, 26416..26460, 26461..26505, 26506..26550, 26551..26595, 26596..26640, 26641..26685, 26686..26730, 26731..26775, 26776..26820, 26821..26865, 26866..26910, 26911..26955, 26956..27000, 27001..27045, 27046..27090, 27091..27135, 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30331..30375, 30376..30420, 30421..30465, 30466..30510, 30511..30555, 30556..30600, 30601..30645, 30646..30690, 30691..30735, 30736..30780, 30781..30825, 30826..30870, 30871..30915, 30916..30960, 30961..31005, 31006..31050, 31051..31095, 31096..31140, 31141..31185, 31186..31230, 31231..31275, 31276..31320, 31321..31365, 31366..31410, 31411..31455, 31456..31500, 31501..31545, 31546..31590, 31591..31635, 31636..31680, 31681..31725, 31726..31770, 31771..31815, 31816..31860, 31861..31905, 31906..31950, 31951..31995, 31996..32040, 32041..32085, 32086..32130, 32131..32175, 32176..32220, 32221..32265, 32266..32310, 32311..32355, 32356..32400, 32401..32445, 32446..32490, 32491..32535, 32536..32580, 32581..32625, 32626..32670, 32671..32715, 32716..32760, 32761..32805, 32806..32850, 32851..32895, 32896..32940, 32941..32985, 32986..33030, 33031..33075, 33076..33120, 33121..33165, 33166..33210, 33211..33255, 33256..33300, 33301..33345, 33346..33390, 33391..33435, 33436..33480, 33481..33525, 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