If the xy-plane, a line contains the points (4,2), (-2,-1) and (k,5). What is the value of k?

A 6

B 7

C 8

D 9

E 10

Use the first two points to find the slope of the line.

From there, you can either use the slope formula again to solve for *k*, or you can just count up and over from (4, 2). A line that goes through (4, 2) and has a slope of 1/2 will go like this:

(4, 2)

(6, 3)

(8, 4)

(10, 5)