Question

How do you solve this:

Determine the value of x so that the given points are collinear.

(x + 1, 4), (2, 1), (2x + 15, -2)

Please, help.

Answer 1

Equate slopes
\[
\frac{1-4}{-x+2-1}=\frac{-2-1}{2
x+15-2}
\]

Answer 2

Solve for x

Answer 3

You will get x =-4

Answer 4

we call the points collinear if they lay on the same straight line

Answer 5

Think: How could you check your results?

Answer 6

Thank you. @eliesaab

Answer 7

YW