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
Answer: W=-1

2. W=-4, S=2
Answer: R=-10

*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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