Answer:

Explanation:
Given

Required
Determine the slope of A'B'
Represent the coordinates of AB with (x,y), such that

Since A'B' is 3 * AB, we have

Substitute (x,y) for AB


Since the slope of AB = 3, then the slope of A'B' is also equal to 3 because dilation through (0,0) does not have effect on the slope