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    mercyhearts's Avatar
    mercyhearts Posts: 1, Reputation: 1
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    #1

    Sep 13, 2011, 09:35 PM
    I Need Help On Mathematics
    If xy + 20 = yw and xy + 20 = dt, then yw = dt
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Sep 14, 2011, 06:24 AM
    That is corect, based on the transitive principal: two numbers that equal the same number must equal each other. Here you have yw = xy+20 = dt, so yw=dt.
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