Given that abcd is a rhombus, what is the value of x?
(3x + 12

The answer is 19.5

Step-by-step explanation

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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).