Which set of ordered pairs represents y as a function of x? {(0, 0), (-1,2), (-1,-2), (-2, 4), (-2,-4)}
{(0, 0), (1, 1), (2, 4), (3,9), (3, 16)}
{(0,0), (0, 1), (0, 2), (0,-1), (0.-2)}
{(0, 0), (-1, -0.5), (-2, -1), (-3,-1.5. (-4,-2)}

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).

-3.5 degrees per hour

step-by-step explanation:

find the unit rate:

-12   1/4 degrees           12.25 degrees

= - = -3.5 degrees per hour

      3   1/2 hours               3.5 hours