Answer:
You pay 581.25, but you save 43.75. :))
Step-by-step explanation:
y = -1x - 3
y2 - y1 / x2 - x1
-1 - (-9) / -2 - 6
8/-8
= -1
y = -1x + b
-1 = -1(-2) + b
-1 = 2 + b
-3 = b
Do you not have a graph to go with it?