Question

whats y= x + 3
8x-7y=12

Answer 1

Are we solving for x and y?

Answer 2

y= x + 3 <---equation 1
8x-7y=12 <-----equation 2
We are given 2 equations we are also given the value of y
So we take equation 1 and substitute it into equation 2 like this:

\[\huge~\rm~ 8x-7=12+x+3\]
from here solve for x :)