subsitution method

Can some one show me how to use the Substitution method to solve the system of these equations.

x + y = -4
x - y = 2

x + y = 10
y = x + 8

on the first set.
Solve for either x or y in either equation, then put that value into the other equation.

Example:
x + y = -4
x - y = 2

solve for x in the first:
x= -y-4
Put it in the second then..
-y-4 -y=2
-2y=6
y=-3
then solve for x..
x=-y-4=-1

  1. 👍
  2. 👎
  3. 👁

Respond to this Question

First Name

Your Response

Similar Questions

  1. algebra

    Use the substitution method to solve the linear system. Thanks! s= t+4 2t+s=19

  2. Substitution Method in Algebra!HELP PLZ!

    Use the Substitution method to solve the system of equations. 3x + y = 5 4x - 7y = -10 multiply first equation by 4 multiply second equation by 3 thus both equations have same x or y value in this case it is the x value. 12x + 4y

  3. 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

  4. Math

    1. Explain the advantages and disadvantages of both the substitution method and the elimination method for solving a system. Help please. The only reasons I can think of is because in substitution it might be more difficult cause

  1. algebra

    solve the system of equations using the substitution method 8x - 9 = y, y - 8x = 4

  2. Algebra 1

    Which method would be the simplest way to solve the system? 7x +5y = 19 -7x-2y = -16 graphing substitution elimination or distributive

  3. Pre-Calc

    Solve the system of equations using either the substitution method or the multiplication/addition method answer: 3x+2y=14 2x-4y=4

  4. math

    If you try to solve a linear system by the substitution method and get the result 0 = 8, what does this mean? A. The system has one solution, (0,8). B.The system has one solution, (8,0). C.The system has no solutions. D.The system

  1. Math

    Solve the following system by the substitution method. Show your work. {2x−7y=12−x+3.5y=−6

  2. Algebra

    -3x + 2y = 8 x + 4y = -4 use substitution method to solve the linear system.

  3. math

    Solve the system of equations by Elimination OR Substitution. Explain why you chose one method over the other. 3x – 2y = 8 2x + 5y = -1

  4. math

    solve by the substitution method. 5x + 7y= -19 x=4-4y what is the solution of the system?

You can view more similar questions or ask a new question.