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

    Nov 11, 2008, 08:18 PM
    solving systems of equations in three variables?
    a+b=3
    -b+c=3
    a+2c=10
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Nov 12, 2008, 11:06 AM

    Note that from the first equation: a = 3-b. Now you can substiute (3-b) where ever an 'a' apears in the other two equations. That gets you to two equations in two unknowns. Can you take it from there?
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