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    zoe1996's Avatar
    zoe1996 Posts: 1, Reputation: 1
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    #1

    Jul 25, 2012, 06:02 PM
    how to do elimination math
    4a-b=10
    a+3b=9
    teacherjenn4's Avatar
    teacherjenn4 Posts: 4,005, Reputation: 468
    Education Expert
    		  
    #2

    Jul 25, 2012, 06:11 PM
    Solve for a or b in either equation. Then substitute your new equation into the equation you didn't solve for yet.
    So, if you solve for a in the bottom equation, what would a=?
    Then plug into the top equation. If you need more help, tell me what a= in the bottom equation then I will help you plug it into the top one.
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