for what value of k the point P (5,4) Q(7 ,K) andR(9, - 2) are collinear.
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1/2(5k_14+36)_(_10+9k+28)
5k+22-18+9k
14k=-4
K=-4/14
K=1/3.5
5k+22-18+9k
14k=-4
K=-4/14
K=1/3.5
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