Sally ordered her groceries online. She accidentally ordered 120 pounds of flour (instead of 10 pounds) and only uses five pounds of flour every two months. (more below)

Question

the equation that represents this situation is: y=-5/2x + 120

why is 120 pounds the y intercept?

Answer 1

At the y intercept, x=0 always. If you plug x=0 into the equation and solve you get:

y=-5/2(0) + 120

y=120 is the y intercept