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Line L1passes through the points A(1,2) and B(3,-4).Find the equation of L2 passing through the mid-point of AB and perpendicular to L1,leaving your answer in the form ax+by+c=0

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  1. L1 has slope 3
    so L2 has slope -1/3
    The midpoint is at (2,-1)
    So, now we have a point and a slope, making the equation
    y+1 = -1/3 (x-2)

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    oobleck

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