SOLUTION: For the following system, use the second equation to make a substitution for x in the first equation. 3x + 2y = 7 x - y + 3 = 0 What is the resulting equation? A.)3x - y

Algebra ->  Graphs -> SOLUTION: For the following system, use the second equation to make a substitution for x in the first equation. 3x + 2y = 7 x - y + 3 = 0 What is the resulting equation? A.)3x - y      Log On


   

Question 1061321: For the following system, use the second equation to make a substitution for x in the first equation.
3x + 2y = 7
x - y + 3 = 0
What is the resulting equation?
A.)3x - y - 3 + 2y = 7
B.)3(y - 3) + 2y = 7
C.)3y - 3 + 2y = 7
Answer by josgarithmetic(39630) About Me  (Show Source):
You can put this solution on YOUR website!
Starting with your SECOND equation,
x-y%2B3=0
x=y-3

Substituting for x into the FIRST equation,
highlight%283%28y-3%29%2B2y=7%29-------the initial result, which can continue until solve for y.

3y-9%2B2y=7
5y-9=7
5y=7%2B9
highlight%28y=16%2F5%29