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If 3 points are collinear the solve for t (-3,3) (t,-1) (8,6)

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    Let A(-3,3), B(t,-1), C(8,6) be the three points.
    If they are collinear, the slope of line AB would be the same as the slope of line BC.
    The slope m of a line between two points is given by
    m = (y2-y1)/(x2-x1)

    Equate mAB and mBC in terms of t.
    Solve for t.

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