Question

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?


3x - y - 3 + 2y = 7
3(y - 3) + 2y = 7
3y - 3 + 2y = 7

Answer 1

first x=y-3
then replace it in the other equation
3(y-3)+2y=7