The points (-7,r) and (1,2) lie on a line with slope 1/2 . Find the missing coordinate r.

Answer 1

(-7,r) (1,2)

line through these points with slope 1/2

1/2 = (2-r)/1--7) = (2-r)/8

4 = 2-r

r = 2-4 =-2

r =-2

points are (-7,-2) and(1,2)