Question 555081
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? 
x-y+3=0
  +y-3. +y-3
X=y-3
3x+2y=7
3(y-3)+2y=7
3y-9+2y=7
5y-9=7