Math in economy, plzzz help solve the question?

Question

Two points on a nonlinear curve have coordinates given by (5, 15) and (17, 13). The average slope of the curve between these points is

(A) -1/6

(B) -6

(C) 1/4

(D) 2.5

Answer 1

The slope is: (y1-y2) / (x1-x2), so (15-13) / (5-17) = 2/-12 =

( - 1/6).

(A) -1/6