math- pre calc

Suppose that (x,5/13) is a point in quadrant 2 lying on the unit circle. Find x. Write the exact value, not a decimal approximation.

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  1. x is negative in Q 2

    (n/13)^2 + (5/13)^2^2 = (13/13)^2

    12=n
    so
    x = 12/13

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    posted by Damon
  2. or, in QII, x = -12/13

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    posted by Steve

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