Answer:
A.
The rate of change is -1, meaning every second the altitude goes down by 10ft
for the second one the rage of change is 2/3, meaning every three days book sales go up by 1000
B.
there is a porportinal liner relationship because the line on the graph is striaght if it wasn’t porpportinal it would be a zigzag line or a a scatter plot
(this applies to both)
