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If the line passing through point (a,1) and (8,7) is parallel to the line passing through the points (4,9) and (a+2,1) what is the value of a?

  • College -

    since the slopes are the same,

    6/(8-a) = -8/(a-2)
    6a-12 = 8a-64
    2a = 52
    a = 26

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