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If B is between A and C, AB=5y+4, BC=7y-3, and AC=20y-7. Find the value of y, AB, BC, and AC.

  • geometry -

    after making a diagram
    it is clear that

    20y-7 = 5y+4 + 7y-3

    solve this for y, then sub it into the expressions given.

    check: you should get 13 for AC

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