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

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Question 478429: i need to figure out the equation of 8x-10y=-80 and -2x-9y=18 then graph it to the y intercept and slope it and then figure out the intersection
Click here to see answer by mananth(12270)

Question 478498: Find the solution to each system by the addition (elimination method) Check your answer.
3x-11y=9
-9+33y=-8
Click here to see answer by stanbon(57290)

Question 478497: Find the solution to each system by the addition (elimination method) Check your answer.
4s-5t=18
6s+10t=-8

Click here to see answer by stanbon(57290)

Question 478495: Find the solution to each system by the substitution method.
2x-5y= -1
x-3y= -3
Click here to see answer by estefany(1)

Question 478495: Find the solution to each system by the substitution method.
2x-5y= -1
x-3y= -3
Click here to see answer by Alan3354(30993)

Question 478503: Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this.-x + 2y = 8 and -x + 10y = 48
Click here to see answer by cleomenius(959)

Question 478496: Find the solution to each system by the substitution method.
10x+3y=8
2x+y=2
Click here to see answer by Alan3354(30993)

Question 478603: I don't understand how to execute this problem: Graph the following equation by plotting points (need to choose from 4 different graphs with plotting points). I know to choose three numbers and replace x with each number, but I don't understand how you would know if your answer is correct. Please help.
Thank you
1Dummy
Click here to see answer by wilft1(67)

Question 478554: Part 1: Write the equation of the line that passes through the points (3, 4) and (–3, –8) in point-slope form.
Part 2: Using complete sentences, explain whether or not it matters which point is used in the final answer. Also explain why you chose the point you did.

Click here to see answer by Alan3354(30993)

Question 478566: what is the equation of the line with the given points (-1,-6) and (-4,-7)
Click here to see answer by mananth(12270)

Question 478687: Write the equation of each line that has the indicated slope, m, and y intercept, b. Express final equations in slope-intercept form. Show all work. m = -3, b = -4.
Click here to see answer by rfer(12657)

Question 478683: Write the equation of each line that contains the indicated pair of points (4,5) and (-1,5). Express final equation in standard form. Show all work.
Click here to see answer by mananth(12270)

Question 478713: gRAPH THE SOLUTION of 5x+3y<15
5x-4y<20
Click here to see answer by mananth(12270)

Question 478799: Buring Calories - The following table list the Calories Burned by a 140 pound person walking at 4 miles per hour for various lengths of time.
Time minutes 6 12 18 24
Calories 32 64 96 128
A) Would it be reasonable to assume that the point (0,0) could be included in the table why or why not?
B) What type of polynomial function would model these data? Explain?
C) Find the function C that models the calories burned in t. minutes.

Click here to see answer by stanbon(57290)

Question 478839: sally can paint a room in 4 hours while it takes steve 7 hours to paint the same room. how long would it take them to paint the room if they worked together?

Click here to see answer by Alan3354(30993)

Question 478719: The line y=0.12x+0.76 represents an estimate of the average cost of gasoline for each year. The line 0.11x-y=-0.85 estimates the price of gasoline in January of each year
a)Do you expect the lines to be intersecting, parallel, or perpendicular? Explain your reasoning.
b)Use the equations of the lines to determine if they are parallel. What did you find?
c)Did your answer to part b confirm your expectation in part a?

Click here to see answer by ankor@dixie-net.com(15647)

Question 478819: Suppose that a market research company finds that at a price of p = $27, they would sell x = 27 tiles each month. If they lower the price to p = $17, then more people would purchase the tile, and they can expect to sell x = 37 tiles in a month’s time. Find the equation of the line for the demand equation. Write your answer in the form p = mx + b.
I do not want someone to just answer the question for me, just showme how to start off. Thank you.
Click here to see answer by ankor@dixie-net.com(15647)

Question 478899: solve the system of equations
3x = 7 – y
2y = 14 – 6x
Click here to see answer by stanbon(57290)

Question 479046: What is the equation of the line passing through points (1,-5) and parallel to y=2x+4?
Click here to see answer by mananth(12270)

Question 479093: I need help with this question:
find the equation of the straight line:
which passes through (-7,4) and makes an angle of 143(deg)8(min) with the X-axis.
I know the equation will look like either ax+by=c or y=mx+n
and i understand y-y1=m(x-x1) = y-4=m(x+7)
how do you convert the angle (143.133) to =m?

Click here to see answer by mananth(12270)

Question 479103: Find the equation of a line containing the points (-5, 5) and (-2,-4). Show your work.
Click here to see answer by Tatiana_Stebko(1326)

Question 479226: rewrite the equation of the line below in standard form.
y+7=2(x-4)
Click here to see answer by nerdybill(6958)

Question 479231: P(x) = 12x - 100
a. describe the meaning of the number -100 in the formula, in terms of its meaning in relation to the profit.
Click here to see answer by mananth(12270)

Question 479244: find the equation of the line that passes through the points (2,3) and (4,7). write your answer in point-slope form.
Click here to see answer by mananth(12270)

Question 479247: find the equation of the line that passes through the points (3,1) and (5,-2). write your answer in standard form.
Click here to see answer by mananth(12270)

Question 479245: find the equation of the line that passes through the point (2,9) and has slope 4. write your answer in point-slope form.
Click here to see answer by Edwin McCravy(8906)

Question 479245: find the equation of the line that passes through the point (2,9) and has slope 4. write your answer in point-slope form.
Click here to see answer by stanbon(57290)

Question 479293: Solve for X:
-3(x+1)-x/2+3/2<0
Click here to see answer by ichudov(499)

Question 479282: . Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this.
5x – 4y = 10.5
20x – 16y = 42

Click here to see answer by stanbon(57290)

Question 479279: Solve using the substitution method. Show your work. If the system has no solution or an infinite number of solutions, state this.
3x + y = 26
-6x + y = -37

Click here to see answer by Alan3354(30993)

Question 479280: Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this.
-2x – 8y = 22
-6x – y = 20

Click here to see answer by Alan3354(30993)

Question 479281: Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this.
4x – 8y = 48
11x + 3y = -105.5

Click here to see answer by Alan3354(30993)

Question 479391: Determine the x- and y-intercepts:
x + (1/2)y = 2

Click here to see answer by wilft1(67)

Question 479396: Factor by grouping:
x2 – 6x + 5x – 30
Click here to see answer by wilft1(67)

Question 479396: Factor by grouping:
x2 – 6x + 5x – 30
Click here to see answer by Alan3354(30993)

Question 479403: Write 120 as a product of prime numbers
Click here to see answer by solver91311(16877)

Question 479417: A line that is perpendicular to y = 2x+5 will have slope
Click here to see answer by solver91311(16877)

Question 479366: in solving the following equation the book says to multiply by 10 but it does not explain why we are only multiplying the second equation by ten and it does not explain where we pulled the 10 from. I understand that in an equation such as 2x-y=6 and 4x-2y=1 that I would only multiply equation number 1 by (-2) so that my final answer would be 0=11 which is inconsistent. However the on-line class and textbook neither one gives and explanation as to where they are getting the multiplier from for the following two examples. could you please explain these to me. If I know why and where they got the multiplier I can solve problems like these in the future. the two equations are
x+0.4y=3.08
0.1x-y=0.1
the book says to multiply only the second equation by 10. Why?
the other one is
-4x+y=-2
8x-2y=4
The book says to multiply the second equation by one half (1/2) again why and where did they get 1/2 from. Thank you for your help
Click here to see answer by scott8148(6628)

Question 479458: Write the equation of the line containing the point (1,2) and parallel to the line 2x + 4y = 1.
Click here to see answer by stanbon(57290)

Question 479458: Write the equation of the line containing the point (1,2) and parallel to the line 2x + 4y = 1.
Click here to see answer by jorel1380(2518)

Question 479498: What is the equation of a line that passes through (1, 8) and (2, -4)?
Click here to see answer by mananth(12270)

Question 479499: What is the equation of a line that passes through (4, 6) and (6, 12)?
Click here to see answer by mananth(12270)

Question 479495: What is the equation of a line that passes through (-1, 8) and has a slope of -1/4?
Click here to see answer by mananth(12270)

Question 479503: Given the equation (x - 3)2 + y2 = 121 of a circle, identify the center and the radius.
Click here to see answer by Edwin McCravy(8906)

Question 479526: can i have help solving x=6 and y=-8
Click here to see answer by stanbon(57290)

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