I I think you have the correct answer!
the slope intercept is 3/2 if you want the transfered equation y=3/2x+8
180 is the totally amount it can be
Divide the number 135 and 5. It is going to be 27. Then you multiply 27 times 4. Then you get your answer which is 108.
Proportion set up....
small 4 ? small
----- --------
big 5 135 big
Cross multiply 4x135= 540
and then divide 540/5= 108
