The function d = 40 - 15x represents the amount of money d (in dollars) you have left after buying x cds

5.5

step-by-step explanation:

look at the picture.

y-intercept for the function on a picture is 4 → point (0, 4).

y-intercept for the function

is for x = 0. substitute:

y-intercept is 8 → point (0, 8).