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

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 Linear Solvers Practice Answers archive Word Problems Lessons In depth

 Question 412922: Kindly answer these problems please because i am still quite confused in answering these problems and please apply system of linear equations. 1) Working together, Tom and Jerry cleaned the swimming pool in 6 hrs. If both of them worked together for the 1st 3 hrs., and Jerry stopped for an errand it would require Tom 4 hrs. to finish cleaning the pool. How long would it take Jerry to clean the pool alone? How long would it take Tom? Thank you in advance! Hoping for your immediate reply. Click here to see answer by ankor@dixie-net.com(15661)

 Question 413003: What is the value of y if 2y + 5 = 29 Click here to see answer by rfer(12670)

 Question 413654: Solve by elimination method. 2r - 7s = 4; 7r + 2s = 67 Answer is s=2; r=9, but when giving the answer by ordered pair isn't it (r,s)? Click here to see answer by richard1234(5390)

 Question 413738: Subsitution {2x-3y=-9 3x=yt4 {8x-3y=4 7x=y+3 {6x-3y=5 x+2y=0 {10x-5y=-21 x+3y=0 {3x-y=1 2x-3y=10 {2x-y=-7 4x-3y=-11 **Steps to solving these problems** Click here to see answer by Alan3354(30993)

 Question 413925: suppose y varies directly as the square of x, a. Find the constant of proportionality if y=4 when x=3. What is x when yis 16? b. if the constant of variation is 5/8, what is y when x=6? what i x when y= 90? c. find the constant of variation and the value of y when x=5 if y=2 when x=2 Click here to see answer by ewatrrr(10682)

 Question 413927: The surface area of a sphere varies directly as the square of a radius. a. if the surface area is 16pi when r is 2, find the constant of variation. b. Find the surface area when the radius is 5. c. Find the radius when the surface area is 48 pi. Click here to see answer by ewatrrr(10682)

 Question 413931: If y varies directly as x^3 and y =400 when x=10 , a. Find y in terms of x. b. Find y when x=5 c.Find x when y=25 3/5 Click here to see answer by ewatrrr(10682)

 Question 414115: carl bought 19 apples of 2 different varieties to make a pie. The total cost of the apples was \$5.10. Granny Smith apples cost \$0.25 each and Gala apples cost \$0.30 each. How many of each type of apple did Carl buy? Click here to see answer by ewatrrr(10682)

 Question 414219: Write an equation in standard form of the line passing through (2,-5) and (-4,7) Thanks. Please answer ASAP for I have a test on monday. I have tried doing the first y minus second y over first x minus second x to find the slope. I got -2. Then I plugged it in to the slope intercept form. Y =mx +b I plugged in one ordered pair and got the y intercept is equal to -1. I got -2x + y = -1 but the textbook said that the answer was 2x +y =-1 Click here to see answer by mananth(12270)

 Question 414333: 3x-2y=-31 5x+-2y=-49 Solve linear systems by adding or subtracting From Holt McDougal text: Florida Larson Algebra 1 Chapter/Section 7.3 extra practice page 908 problem 15 Click here to see answer by stanbon(57395)

 Question 414234: Sarah purchased two picture frames. The perimeter of the larger frame is 240cm, and the perimeter of the smaller frame is 140cm. The height of the smaller frame is the same as the width of the larger frame, and the width of the smaller frame is 10cm less than the height of the smaller frame. Find the dimensions of the larger frame. Click here to see answer by ankor@dixie-net.com(15661)

 Question 414446: write and equation of the line passing through (0,2) that is perpendicular to y= -4x+6 Click here to see answer by rfadrogane(214)

 Question 414442: 1) write an equation of the line that is "parallel" to the given line and passes through the given point. y=2x+2,(3,2) Click here to see answer by Alan3354(30993)

 Question 414554: Need some help please. Huge final due soon. Solve the following systems of equations x+9y=8 (1) x=5-9y (2) Click here to see answer by algebrahouse.com(1079)

 Question 414577: solve the linear system: y=2x+2 equ 1 x+3y=41 equ2 Click here to see answer by mananth(12270)

 Question 414848: Fred weighs 187 pounds but is on a diet that makes him lose 1.7 pounds per week. Barney weighs only 93 pounds but is on a diet that makes him gain 0.9 pounds per week. What is the number of weeks it takes for Fred and Barney to weigh exactly the same amount? How many weeks does it take for their total weight to equal 252 pounds? Click here to see answer by stanbon(57395)

 Question 414942: The perimeter of a triangle is 5 ft. The longest side of the triangle measures 20 in. more than the shortest side. The middle side is 3 times the measure of the shortest side. Find the lengths of the three sides in inches. so far i have this but I'm not sure if their right P=5 ft.? L=S+20? M=3s? Click here to see answer by ankor@dixie-net.com(15661)

 Question 415418: I need help on a question on homework. Here is the problem: Write a system of inequalities whose solution is the set of all points in quadrant 1 not including the axes. Click here to see answer by stanbon(57395)

 Question 415423: I need help with figuring out how to work these types of problems. Step by step. For example, here are two examples of problems I need help understanding how to work. Solve - -2(-1-3y)=7y solve 7(6=w)=6(2+w) I know the goal is to get the variable by itself but I am confused. Please advise. Thanks! Click here to see answer by stanbon(57395)

 Question 415469: How would you do a linear system that has one equation with a fraction, using the elimination method? Such as the following: 3/2x + y= -5/2 4x + y= -5? Your help is much appreciated. Click here to see answer by stanbon(57395)

 Question 415485: The formula h=vt-16^2 models a football being kicked into the air where h is the height of the ball in feet above the point at which it is kicked and t is the time in seconds. If the initial velocity, v of the kick is 48 feet per second, how long will the ball remain in the air before returning to the ground? Sketch graph and lable the zero points with x & y coordinates. Click here to see answer by solver91311(16897)

 Question 415598: Tell whether the following system has one solution, infinitely many solutions or no solution: x= -7y+34 x+7y=32 Click here to see answer by richard1234(5390)

 Question 415634: how do i solve algebraically for x: (1/x+3)-(2/3-x)=(4/x^2-9)? Click here to see answer by lwsshak3(6522)

 Question 415675: Solve by using the elimination method: 5x + 6y=5 10x + 12y=10 Click here to see answer by Theo(3464)

 Question 415705: how do i solve y=-x also how do i solve x=3y? Click here to see answer by Theo(3464)
 Question 415705: how do i solve y=-x also how do i solve x=3y? Click here to see answer by Gogonati(809)

 Question 415775: In the following system of equations, what does x equal? 8x - 8y = 16 4x + 4y = -72 Click here to see answer by ewatrrr(10682)

 Question 416415: Solve 3x+y=-3 and y=x+5 by using substitution. Express your answer as an ordered pair. A)( -2,3) B) (-8/3,-3) C) (3,-2) D) (-4/3,1) Click here to see answer by MathLover1(6638)

 Question 416975: Solve using the substitution method x + 4y = 2; 6x + 5y = -12 Click here to see answer by MathLover1(6638)
 Question 416975: Solve using the substitution method x + 4y = 2; 6x + 5y = -12 Click here to see answer by Gogonati(809)

 Question 416973: Solve using the substitution method x + y = -4; y = 3x + 2 Click here to see answer by MathLover1(6638)

 Question 416996: I am having alot of trouble with this problem. plz help 3y+x=-1 x=-3y Click here to see answer by ewatrrr(10682)
 Question 416996: I am having alot of trouble with this problem. plz help 3y+x=-1 x=-3y Click here to see answer by MathLover1(6638)

 Question 417457: Solve for A B C: 4a+7b=1 8a-2c=-38 6b-2c=20 How do I begin to do this? Click here to see answer by ewatrrr(10682)