Question

The midpoint of a line segment with end points as (x, 4) and (-2, -2) is (2, 1). What is the value of x?

Answer 1

Midpoint is halfway between the two lines so you add each component and half it to find the middle coordinates. You can construct the following equation for the x component to solve for x:
(1/2)(x + (-2)) = 2
-> x + (-2) = 4
-> x = 6

Answer 2

thanks :)