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March 29, 2017

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(In this question the answer is -4, please explain how did they get it)

If A and B have coordinates -15 and 11, what is the coordinate of X if X is 4 units farther from B as from A?

  • math - ,

    Always make a sketch
    Place X between A and B , a bit closer to A

    XB - XA = 4
    11-x - (x-(-15)) = 4
    11-x - x - 15 = 4
    -2x = 8
    x = -4

    check by counting the result on the number line

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