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math

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On a number line, the coordinate of A is -18 and that of B is 18. C is a point on AB such that AC:CB = 4:5. What is the coordinate of C?

with solution pls... tnx...

  • math -

    Did you make a sketch showing C somewhere between A and B ?
    Mark the position of C with x
    then AC =x-(-18) = x+18
    and CB = 18-x

    then (x+18)/(18-x) = 4/5
    cross-multiply
    5x + 90 = 72 - 4x
    9x = -18
    x = -2

    so C is at -2

    check by counting.

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