Question

Two lines are parallel. One passes through the points (-3,4) and (5,k) and the other has slope -2. What is the value of k?

Answer 1

y = mx + b
4 = -2(-3)+b
4 = 6 + b
-2 = b

y = -2x -2 equation...no substitute 5 in for x, and you'll get k

Answer 2

k = -2(5)-2
k = -10-2
k = -12

Answer 3

Another way...y1 - y2 / x1-x2
4-k / -3-5 = -2
4-k/-8 = -2
4-k = 16
-k = 12
k=-12