Questions on Algebra: Systems of Linear Equations answered by real tutors!

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Question 659838: x squared - y squared = 80
x - y = 16
x + y = ?
Click here to see answer by ewatrrr(24785)

Question 659973: complete the ordered pairs for the given equation:
3x+2y=12
(0, ),( ,0), (4/3, ),( ,-3)
Click here to see answer by solver91311(24713)

Question 659980: Find the x and y intercept:
x+y=6

Click here to see answer by math-vortex(648)

Question 659990: Find the x and y-intercept:
x-y=1
Click here to see answer by mrnoneal(1)

Question 659977: complete the ordered pairs for the given equation:
7x+3y=21
(0, ),( ,0),(6, ),( ,14)
Click here to see answer by Edwin McCravy(20055)

Question 660101: 8c+5d-4(6c-2d)
Click here to see answer by jim_thompson5910(35256)

Question 660115: given y=4/6 and (-7,-7)
given answer -x-13 answer maybe off by 1 according to teacher he gave us the answer a head of time we have to find the parallel line of y=-x-13.i tried plugging in y-y1=m(x-x1)+b and plugging in the two sevens but i get lost after that
Click here to see answer by Alan3354(69443)

Question 660699: Ice forms at a temperature of 0 degrees celsius, which corresponds to a temperature of 32 degrees fahrenheit. A temperature of 100 degrees celsius corresponds to a temperature of 212 degrees fahrenheit.
Write and graph the linear equation that gives the number 'y' of degrees fahrenheit in terms of the number 'x' of degrees celsius.
Click here to see answer by Alan3354(69443)

Question 660956: Please help me solve this system of equations:
Directions: Solve using elimination and using the matrix method
x+y+z=6
2x-3y+5z=-11
x+3y-4z=19
Work I have done so far:
x+y+z=6
-x-3y+4z=-19 This equals -2y+5z=-13 equation #1
-2x-6y+8z=-38
2x-3y+5z=-11 This equals -9y+13z=-49 equation #2
Multiply equation #1 by -9 and multiply equation #2 by 2
18y+45z=117
-18y-26z=-98 z= -19/71
At this point I got stuck because my teacher said that all answers would be nice even numbers. When I solved the equations using the matrix method (I know how to do this part) I got (3,4,-1) which I checked and is the correct answer.

Click here to see answer by MathTherapy(10552)

Question 661014: solve using elimination or substitution
5/3 d - 3/5 g = 61
3/5 d + 5/3 g = -91
Having trouble clearing the fractions. I used 15 as the LCD and got
25d -9g =915
9d + 25g = -1365
but then I get weird numbers from there...
Click here to see answer by Edwin McCravy(20055)

Question 661070: Numa papelaria, quando calculamos o pre�o de um caderno somado ao pre�o de duas canetas, usamos express�es como 1x+2y, onde x representa o pre�o do caderno e y o pre�o de cada caneta.
Click here to see answer by Edwin McCravy(20055)

Question 661567: how do you solve this.. x+2y=5 solve each system of equation
x-y=-1
Click here to see answer by ReadingBoosters(3246)

Question 661650: Explain how to solve systems of linear equations in two different ways
Click here to see answer by lynnlo(4176)

Question 662036: x+4/5x=-2/7
Click here to see answer by ReadingBoosters(3246)

Question 662125: If y varies inversely as the square of x, and y = 1/2 when x = 1, find y when x = 9. Thanks!
Click here to see answer by ewatrrr(24785)

Question 661852: help with
1/5 x + 3 = 4
Click here to see answer by ReadingBoosters(3246)

Question 662280: Solve the system by the substitution method
4x + y = 25
3x + 4y= 22
the answer the teacher got was 5,10
but I can not figure out how to get there.
Click here to see answer by Alan3354(69443)

Question 662625: I need to setup linear equation for the following:A 7 mile cab ride cost $10.20, a 10 mile cab ride is $13.80. Find a linear equation that models a relationship bewtween the cost (c) and the distance (d).
Click here to see answer by stanbon(75887)

Question 662746: use the matrix method to solve the system of linear equations:
x+ y- z= 0
3x- y+3z=-2
x+2y-3z=-1

Click here to see answer by jim_thompson5910(35256)

Question 663011: How would I solve this using elimination:
1/x + 3/y = 3/4
3/x - 2/y = 5/12

Click here to see answer by MathLover1(20850)

Question 663043: I need to solve by slope and y-intercept but I was only give these two clues:
x=3
x=-2
Can you please help me?
Click here to see answer by MathLover1(20850)

Question 663060: The plans for a shed call for a rectangular floor with a perimeter of 192 feet. The length of is two times the width. Find the length and width.
Click here to see answer by ReadingBoosters(3246)

Question 663147: I need 25 lb of a combination of product A 27 lb/cube ft & product B 13 lb/cube ft how much of each will I need. What is the formula?
Thank you
Click here to see answer by ankor@dixie-net.com(22740)

Question 663284: 3x+y=4
9x+3y=6
using elimination
Click here to see answer by jim_thompson5910(35256)

Question 663314: 9x-3>6x-12
Click here to see answer by jim_thompson5910(35256)

Question 663330: use the elimination method to solve the system of equations
a+8b=1
a+3b=-4
Click here to see answer by checkley79(3341)

Question 663462: Please help ,my son wants to quit school over this and I have no idea haw to help him.I don't have money to pay for private help .
Ne 1
Solve the following system of equations for X and Y .Elimination , keep as fractions .
1 + 3 = 3
--- --- ----
2X + 2y = 8

9 - 6 = 15
-- --- ----
x - y = 12
Nr 2 solve the following system of equations for x,y,z
2x - 3y + z = 10
3x + 6 z = 24
- 5 y - 20z = -55 substitution
nr 3
A triangle is formed by the intersection of the lines 2x + 3y = 14
4X - 5y= - 16 and the x- axis.Find the area of the triangle

Click here to see answer by ReadingBoosters(3246)

Question 663565: how do i solve this: 2xy+9x-5

Click here to see answer by ReadingBoosters(3246)

Question 663727: convert between degress fahrenheit and degrees celsius using the literal equation given:
c=(5/9)(f-32) find the celsius when f=100
Click here to see answer by ReadingBoosters(3246)

Question 663774: 5(2x+3)=2(3x+7)
Click here to see answer by jim_thompson5910(35256)

Question 663729: convert the follwing eqaution from slope-intercept form to standard form
y=-9x - 3
Click here to see answer by jim_thompson5910(35256)

Question 663934: Solve system of equations by the addition method
5x=2+7y
3x+4y=34
Click here to see answer by ReadingBoosters(3246)

Question 664285: A triangle is formed by the intersection of the lines 2x + 3y = 14
4X - 5y= - 16 and the x- axis.Find the area of the triangle
Thank you so much .
Click here to see answer by ReadingBoosters(3246)

Question 664356: find the slope and y-interept if possible of the equation of the line sketch the line
y=-3/2x+6
Click here to see answer by ReadingBoosters(3246)

Question 664622: Solving system using substituiton
3x+7y=13
X+3y=-7
Click here to see answer by ronalee(3)

Question 664781: i need help with this question
4x-y=-9
-12x+3y=27 may you please help me on it thanks
Click here to see answer by Alan3354(69443)

Question 664923: substitution method
5x-2y=2
x+4y=0
Click here to see answer by ewatrrr(24785)

Question 664931: Solving Systems of Equations by Elimination
3x-6y=12
-2x+3y=6
Click here to see answer by lynnlo(4176)

Question 664945: what is the slope of the line that has an equation y=-2x+8
Click here to see answer by lynnlo(4176)

Question 665027: 4x � 3y greater than or equal to 0
2x + 5y > 40
how would you graph this
Click here to see answer by vleith(2983)

Question 665382: how to solve:
x+2z=5
-4x+6y=0
x-2z=9
and figuring what X,Y,and Z is
Click here to see answer by lynnlo(4176)

Question 665382: how to solve:
x+2z=5
-4x+6y=0
x-2z=9
and figuring what X,Y,and Z is
Click here to see answer by MathTherapy(10552)

Question 665403: What is the solution to this system of linear equations using the substitution method?
1/2x-1/5y=6
1/6+2/5y=9
Click here to see answer by mananth(16946)

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, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840, 6841..6885, 6886..6930, 6931..6975, 6976..7020, 7021..7065, 7066..7110, 7111..7155, 7156..7200, 7201..7245, 7246..7290, 7291..7335, 7336..7380, 7381..7425, 7426..7470, 7471..7515, 7516..7560, 7561..7605, 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