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its 4 because 2 times 2 is 4, if you double the number two you get four

30

step-by-step explanation:

times by times

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).