Answer:
y = x + 8
Step-by-step explanation:
y - y1/x - x1 = y2- y1/x2 - x1
y - 8/x-0 = 9 - 8/1 - 0
y- 8/x = 1
y-8 = x
Expanded:x²-7x+4x-28
Simplified: x²-3x-28