Question

The points (-1, 5) and (7, r) lie on a line with slope 5/4
Find the missing coordinate r.

Answer 1

15

Explanation:

7-(-1) is 8

8 divided by 4 (x or “run” of slope) is two

Two times five (y/rise of slope) is ten

5 (from original point -1,5) plus 10 is 15

(7,15)