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    Confused239's Avatar
    Confused239 Posts: 4, Reputation: 1
    New Member
    		  
    #1

    Mar 23, 2009, 07:54 PM
    Elimination confusion!
    Hey guys I got a test tomorrow so hopefully someone will help me out with this and answer it haha =P

    okay so in elimation.. lets use this problem.

    5x-8y=25
    -x+4y=-7

    My main question is do I put it in y=mx+b form? I know to multiply 4y by 2 to make it 8y, but do I put it into y=mx+b first?

    Please get back to me I got a HUGE test tomorrow. THANKS!
    ROLCAM's Avatar
    ROLCAM Posts: 1,420, Reputation: 23
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    #2

    Mar 24, 2009, 03:04 AM

    5x-8y=25
    -x+4y=-7

    5x-8y = 25
    -2x+8y = -14

    Eliminte the ys
    You get

    3x= 11
    x = 3 2/3
    ____________________________________

    5x-8y=25

    (5*3 2/3)-8y = 25

    55/3
    =18 1/3-8y =25
    -8y = 25 -18 1/3
    -8y = 6 2/3
    -y = ( 20/3)/8
    -y = 20/24
    -y = 5/6
    y = -5/6

    ______________________________________

    GOOD LUCK IN YOUR TEST!
    rolcam.
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