Answer:
3.
Explanation:
Rate of change of function 2 = y2-y1 / x2 - x1
If we use x1 = 0 and y1 = (3(0) + 1 = 1 and x2 = 4 and y2 = 13,
the rate of change = (13-1)/ (4-0) = 12/4 = 3.
The rate of change of function 1 is zero.
So the answer is 3-0 = 3.
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