Answer:
It has one solution
Step-by-step explanation:
y = x-3 equation 1
3y-3x = -9 equation 2
Substitute x -3 in place of y in equation 2.
We have
3(x-3) -3x = -9
Distribute
3 x x 3x-3 -3x = -9
3x - 9 - 3x = -9
It can also be written as
3x - 3x - 9 = - 9
Add nine to both sides
3x - 3x -9 + 9 = -9 + 9
0 + 0 = 0
0
