Match each equation with its y intercept

To find the y-intercept, use x=0 in the equation. 
First equation:
for x=0 we get by=a, then answer y=a/b.
Second equation:
For x=0, we get ay=c then y=c/a.
Third equation:
for x=0, by=c then y=c/b.
Fourth equation:
For x=0, ay=b then y=b/a.

3x+9+4x+x=8x+9that's the answer for your question.