when you plot 4, -4 you have your first clue and point. then go up 5 and right 4 or down5 and left 4. When you go down you will reach the y intercept. On the number- 9. So -9 is your y intercept which goes in b.
Since 5/4 goes in the mx since it is slope the answer is y = 5/4 - 9
