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adult education

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Math
If the line passing through the points (1,a) and (4,-2)is parallel to the line passing through the points (2,8) and (-7,a + 4), What is the value of a ? Please help, I don't understand how to set this one up.

  • adult education - ,

    If they are parallel, they have the same slope.

    line slope=(a+2)/(-3)
    second line slope=(-a+4)/(9)
    set them equal and solve for a.

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