Question

http://prntscr.com/57s16u

Answer 1

You're trying to isolate y and get it by itself so to do this you must first subtract 4x from each side to get
\[-5y=-4x+9\]

Answer 2

y is still not by itself so next we need to divide by -5 to each side.

Answer 3

\[y=-\frac{ 4 }{ 5 }x+\frac{ 9 }{ 5 }\]

Answer 4

But since you're dividing your answer by a negative your answer would be
\[y=\frac{ 4 }{ 5}x-\frac{ 9 }{ 5 }\]