12/3=4
4*15=60
60*(9)=540
540+3=543
We need a picture im guessing
75.50/78.25 = x/100
Using this proportion, finding x will find the percentage out of 100 that 75.50 is of 78.25
75.5*100=78.25x
x= 7550/78.25 = 96.486%
Or you could just do 75.5/78.25 to get the same answer.
The slope is -5 if i am not mistaken.