Questions on Algebra: Graphs, graphing equations and inequalities answered by real tutors!

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Question 175086: 15x + 20y = 400
What is the process to solve this equation for x and y?
Click here to see answer by Alan3354(69443)

Question 175272: what is the inequalities of algebraically is like x^2-2x-15 < 0?
Click here to see answer by jim_thompson5910(35256)

Question 175286: What's the equation of a line that passes through points (0,-1) and (2, 3 )?
Click here to see answer by Alan3354(69443)

Question 175317: Is each number following the inequality a solution of the given equality. Please explain:

D ≤ 17/3;5
Click here to see answer by nycsub_teacher(90)

Question 175375: Thank you in advance for helping me with this.
f(x)= I need to graph this quadratic funtion by completing the square. I figured out the vertix as -17/8,-3/4 I am stuck on figuring out the two other points. I need help, thank you
Click here to see answer by EMStelley(208)

Question 175484: Write an equation of the line that has each pair of intercepts:
X-intercept:-3, Y-intercept:6 How do I do this?
Click here to see answer by jim_thompson5910(35256)

Question 175623: Graph each function. State the vertex and the y-intercept. Find its maximum or minimum value.
1.) y = -(x-2)^2 + 1
2.) y = -x^2 + 7
Click here to see answer by josmiceli(19441)

Question 175629: If the digits of a two-digit positive interger are reversed, the result is 6 less than twice the original numder. Find all such intergers for which this is true.
How do you figure this out?
Click here to see answer by ankor@dixie-net.com(22740)

Question 175622: Graph each function in standard form. State the vertex and axis of symmetry.
1.) y = 2x^2 + 8x - 3
2.) y = -0.5x^2 + 5
Click here to see answer by stanbon(75887)

Question 175640: Demand equation. Helen�s Health Foods usually sells 400 cans of ProPac Muscle Punch per week when the price is $5 per can. After experimenting with prices for some time, Helen has determined that the weekly demand can be found by using the equation
D = 600 � 40p
where d is the number of cans and p is the price per can.
a) Will Helen sell more or less Muscle Punch if she raises her price from $5?
b) What happens to her sales every time she raises her price by $1?

c) Graph the equation.

Click here to see answer by vleith(2983)

Question 175688: i am supposed to get the formula y-y1=m(x-x1) into the formula y=mx+b. the problem is: y-2=7(x-1). i have an idea how to do this, but i'm still lost.
Click here to see answer by stanbon(75887)

Question 175715: 2(S+4)<16 BUT UNDER (<) THERE IS A LINE UNDER IT OK
Click here to see answer by Mathtut(3670)

Question 175724: I have no idea wat any of theproblems are asking!!!!
Click here to see answer by Mathtut(3670)

Question 175841: im in the eighth grade and i need help with my algebra so can you please help me with this problem -10+4b=?
Click here to see answer by Mathtut(3670)

Question 175852: Please help me Plot at least five points for the following equation:
X � 2Y = 6

Thanks,
Click here to see answer by jojo14344(1513)

Question 175850: Please help me Plot at least five points for the following equation:
X � 2Y = 6

Thanks,
Click here to see answer by Alan3354(69443)

Question 175993: How can you explain if
3/5 > 2/3
Click here to see answer by stanbon(75887)

Question 175098: Whats the point of intersection
1) 4x+2y=0
3x-y=-10

2) -3x+3y=3
2x-y=-5

3)-0.1x-0.8y=2
0.6x-o.5y=-1.4

Click here to see answer by EMStelley(208)

Question 176104: its on page 368i need help with graphing
Click here to see answer by Alan3354(69443)

Question 176122: thank you in advance for helping me with this equation. I need to graph
f(x)=-square root of (x+2) then add 2. Thank you for helping me with this.
Click here to see answer by Mathtut(3670)

Question 176120: Thank you in advance for helping me with this equation. I need to graph this equation. f(x)= (x+3)^3-1 I need an example of how to go at this. Thanks again.
Click here to see answer by Mathtut(3670)

Question 176121: Again, thank you in advance for showing me how to breakm this down to graph. I need an example of what to do. The equation I need to graph is f(x)= 2|x+1|-4.
Click here to see answer by Fombitz(32388)

Question 176156: thank you in advance for helping me find the vertex and two other points on the graph for the equation. f(x)=(x-3)^3-1 I know what the graph will look like I need to find the vertex and other points thanks again.
Click here to see answer by Fombitz(32388)

Question 176084: absolute value(1x+10)greater than or equal to 20
please help me solve this inequality
thanks
Click here to see answer by EMStelley(208)

Question 176168: this is one question with different parts
Find the vertex, line of symmetry, maximum or minimum value of the quadratic function, and graph the function.
f(x)=-2x^2+2x+3
x-coordinate of vertex
y-coordinate of vertex
equation of line of symmetry
max/min value of f(x)
The value of f(1/2)=7/2 is min or max
Please help I have no idea what I am doing thank you
Click here to see answer by solver91311(24713)

Question 176166: one question several parts
Graph the function, Find the vertex, line of symmetry, maximum or minimum value.
f(x)=(x+1)^2-2
(for vertex type ordered pair)
Min. value is f(x)=
please help
thank you
Click here to see answer by Mathtut(3670)

Question 176169: thanks in advance for your help. How do I find the starting point of this line on a graph with this equation. I am confused. f(x)= - squareroot of (x+2) + 2
How do I put a neg. number under a square root? Thanks for your help.
Click here to see answer by solver91311(24713)

Question 176167: This is 1 question iwth different parts pelase help
thank you
Find the vertex, line of symmetry, maximum or minimum value of the quadratic function and graph the function.
f(x)=2x^2-20x+53
vertex is
(type an ordered pair)
What is the line of symmetry
The max/min value of f(x) is
Is the value, f(5)=3 a min or max

Click here to see answer by Mathtut(3670)

Question 176164: This is one question with different parts
Find the vertex, line of symmetry, maximum or minimum value of f(x), and graph the function.
f(x)=-(x+7)^2-2
vertex is
(type and ordered pair)
line of symmetry x=
The max/min value of f(x) is
The value, f(-7)=-2 is
any help thank you
Click here to see answer by solver91311(24713)

Question 176162: Functions
this is one problem with different parts please help thank you
Find and label the vertex and the line of symmetry. Graph the function
F(x)=-3(x+3)^2
The vertex is
(type and ordered pair)
The equation of the line of symmetry is
x=

Click here to see answer by solver91311(24713)

Question 176174: Please help I believe these problems fall into the above catagory.
4. 7x � 2y = 8
-14x + 4y = 8
5. 7x � 2y = 8
-14x + 4y = -16
Solve the inequality:
3x � 2.5y = 7.125
2.5x - 3y = 7.3125

Click here to see answer by Fombitz(32388)

Question 176380: graph the function f(x) = x^3 - 4
Click here to see answer by Mathtut(3670)

Question 176417: Graph the line with the given point and slope.
The line through (-2, 5) with a slope -1.
Click here to see answer by jim_thompson5910(35256)

Question 176423: how can i solve this by graphing

y=x+2
y=-2x+2
Click here to see answer by jim_thompson5910(35256)

Question 176113: Just not sure how to get started. I think that once I do, I will be fine.
F = 1.8 �C + 32.0
The following data were calculated in this way:
Temperature �F
Miles east from starting point

85.2
0

84.5
15

83.6
25

Provide a plot of temperature versus distance east. Based on its appearance, is it a good linear model for predicting temperature as a function of distance?
Use the graph to determine the expected temperature at 75 miles east,
Click here to see answer by Fombitz(32388)

Question 176465: graph each question.
y-2=(x-3)
Click here to see answer by Mathtut(3670)

Question 176348: Age at first marriage. The median age at first marriage for
females increased from 24.5 years in 1995 to 25.1 years in
2000 (U.S. Census Bureau, www.census.gov). Let 1995 be
year 5 and 2000 be year 10.
a) Find the equation of the line through (5, 24.5) and
(10, 25.1).
b) What do x and y represent in your equation?
c) Interpret the slope of this line.
d) In what year will the median age be 30?
e) Graph the equation.
Click here to see answer by ankor@dixie-net.com(22740)

Question 176566: how can you tell from the equations how many solutions the linear system has?
x-y=2 equation 1
4x-4y=8 equation 2
how to solve
Click here to see answer by Mathtut(3670)

Question 176567: how can you tell from the equations how many solutions the linear system has?
2x + y = -1
-6x - 3y = -15
Click here to see answer by Mathtut(3670)

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, 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