Ared hat cost $21 and that is 3 times as much as blue hat costs. how much does a blue hat cost?

answer: the answer is ann

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).