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

    Jan 25, 2011, 12:37 PM
    algebraic proofs
    if 2(x-7)+4 = x then x=10.
    write the algelbraic proof for this problem?
    jcaron2's Avatar
    jcaron2 Posts: 986, Reputation: 204
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    #2

    Jan 25, 2011, 01:01 PM
    Just plug in 10 in place of x in the equation. As long as the result turns out to be true, that proves x really does equal 10.

    2(10-7) + 4 = 10 ?
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