# Geometry

W, R, and S are points on a number line, and W is the midpoint of point RS. For each pair of coordinates given, find the coordinate of the third point. Please correct me if I'm wrong!

1. R=4, S=-6

2. W=-4, S=2

*Could you please explain how you solve and get these two answers? Thanks!

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1. the midpoint is the "average" of the two values

so for the 1st:
(4 + (-6))/2 = -2/2 = -1

in the second, you are given the "average"
let one of the endpoints be x

so (2+x)/2 = -4
multiply by 2
2+x = -8
x = -10

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posted by Reiny
2. Verify you answer by drawing a number line, putting in the values you found or those that were give and
"count"

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posted by Reiny

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