Which number is the constant of proportionality
x|y
3|7 1/2
5|12 1/2

about 0.75 hours

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).