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    dell2012's Avatar
    dell2012 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Apr 9, 2009, 04:03 PM
    solve this equation using elimnation?
    2x-4y=40
    2y=-8-5x
    ngasnier's Avatar
    ngasnier Posts: 30, Reputation: 4
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    #2

    Apr 9, 2009, 06:33 PM
    simplyfying the 2nd eq:
    y=-4-5/2x

    substitute back into the 1st eq :
    2x - 4(-4 -5/2x) = 40

    solve it for x
    x = 2 and subst back into the original eq & y=-9
    ROLCAM's Avatar
    ROLCAM Posts: 1,420, Reputation: 23
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    #3

    Apr 9, 2009, 06:40 PM

    2x-4y=40
    2y=-8-5x

    2x-4y=40
    5x+2y=-8

    2x-4y=40
    10x+4y = -16

    eliminate the y's

    12x =24
    x = 2

    2x-4y=40
    4 - 4y = 40
    -4y = 40 - 4
    -4y = 36
    y = -9
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