Algebra

How do I solve the following by substitution:
5x -2y =-5
y - 5x = 3

8x - 4y = 16
y = 2x - 4

4x -12y =5
-x + 3y = -1

  1. 👍 0
  2. 👎 0
  3. 👁 49
asked by Carl
  1. 5x -2y =-5
    y - 5x = 3

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

    5x -2y =-5
    10x -2y =-6

    15x =-1

    x= -1/15

    (-1/15x5) -2y =-5

    -1/3 -2y=-5
    +1/3 +1/3

    -2y= 4 2/3
    /-2 /-2

    y= -2 1/3





    x= -1/15
    y= -2 1/3

    1. 👍 0
    2. 👎 0
    posted by sonnytsn
  2. Thank you for your help!

    1. 👍 0
    2. 👎 0
    posted by Carl
  3. lol np bro

    1. 👍 0
    2. 👎 0
    posted by sonnytsn

Respond to this Question

First Name

Your Response

Similar Questions

  1. algebra

    i need help with these problems (either a solution or how to plug them into a graphing calculator): 1) Solve by substitution or elimination 4/x + 1/y + 2/z = 4 2/x + 3/y - 1/z = 1 1/x + 1/y + 1/z = 4 2)Solve the system of

    asked by Alyssa on April 5, 2011
  2. Algebra PLEASE HELP!!

    What advantages does the method of substitution have over graphing for solving systems of equations? Choose the correct answer below. A. Graphing cannot be used to solve dependent or inconsistent systems due to the nature of the

    asked by zwgz123 on December 15, 2017
  3. Substitution Method-Plz help

    Use the Substitution method to solve the system of equations. x + y = -4 x - y = 2 solve for x in the second equation. x= y+2 Put that in for x in the first equation: x+y=-4 (y+2) + y = -4 solve for y. Then, x= y+2 i don't get

    asked by Svetlana on October 17, 2006
  4. Math

    17) solve this linear system using the method of substitution. 2y-x=-10 y= -3/2x-1 20) simplify then solve by substitution 2(x-4)+y=6 3x-2(y-3)=13 just need help with these 2.

    asked by Ma names Jeff on February 27, 2016
  5. Algebra

    I need help learning to solve substitution. I have a problem that says solve the system by substitution -4.5x-2y=-12.5 3.25x-y=-0.75

    asked by Samantha on October 8, 2017
  6. Linear Equations

    Can you please help solve this equation using the substitution method? I have tried and keep getting that X and Y = 7/2, but the answer in the book states no solution, inconsistent system. What am I doing wrong? Please help! Solve

    asked by Mia on March 2, 2010
  7. math

    solve each system of equations by substitution. y=3x-9 please help explain how to solve this using substitution.

    asked by eliza on May 12, 2009
  8. Math

    Solve the integral of (x*e^2x)/(1+2x)^2 by first using u substitution and then use integration by parts. I am very confused on how to do u-substitution with this because no mattter what I let u be equal to the du never comes out

    asked by Dave on September 29, 2017
  9. Algebra

    Can someone please help solve this? Solve by using addition or substitution or addition. 10x+2y=7 y=-5x+3 the answer my got was x=11/10 y=-2 My teacher said that was wrong. Never mind this post I found out how to solve it. Try

    asked by jessica on May 9, 2007
  10. math

    Solve systems by substitution 5x - 2y = -5 y - 5x = 3 Substitute 5x + 3 for y in the first equation, and solve it for x. Once you have x, use either of the two equations you wrote to solve for y.

    asked by Robin on August 8, 2007
  11. Algebra

    I have a few questions I need help with! 1. Solve the system by triangularizing the augmented matrix and using back substitution. If the system is linearly dependent, give the solution in terms of a parameter. -3x+y-z=-4

    asked by Kristen on March 27, 2013

More Similar Questions