What is the slope of -2,-5 and 18,-5

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Δabc is dilated by a scale factor of 3 with the origin as the center of dilation to form δa′b′c′. the slope of is -1.2. the length of is p units, the length of is q units, and the length of is r units. the slope of is . the length of is units.

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)