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    Adderb's Avatar
    Adderb Posts: 11, Reputation: 1
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    #1

    Jan 25, 2007, 12:25 PM
    math elimination problem
    5x-8y = 25
    -x+4y = -7

    This is what I did:

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

    x = 11/3??

    Is this right? What are the next steps and how would you write this? :confused:
    cool_dude's Avatar
    cool_dude Posts: 124, Reputation: 9
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    #2

    Jan 25, 2007, 01:31 PM
    yes 11/3 is correct for x value. Now you must sub this value into one of the equations to get the y value.
    Adderb's Avatar
    Adderb Posts: 11, Reputation: 1
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    #3

    Jan 25, 2007, 01:52 PM
    Ok, thanks. But now if I plug into the first equation it looks like this:

    5(11/3) - 8y = 25

    What do I do now?
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #4

    Jan 25, 2007, 02:15 PM
    Multiply out the brackets and solve...
    Nosnosna's Avatar
    Nosnosna Posts: 434, Reputation: 103
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    #5

    Jan 25, 2007, 02:16 PM
    Just solve for y in that new equation the same way you solved for x before.
    cool_dude's Avatar
    cool_dude Posts: 124, Reputation: 9
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    #6

    Jan 25, 2007, 03:02 PM
    Quote Originally Posted by Nosnosna
    Just solve for y in that new equation the same way you solved for x before.
    Not exactly the same. Capuchin was correct by saying just multiply out the brackets and solve. Post your answer and we'll tell you if its right
    Adderb's Avatar
    Adderb Posts: 11, Reputation: 1
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    #7

    Jan 25, 2007, 03:45 PM
    I got -10/12? Is the answer 11/3, -10/12
    cool_dude's Avatar
    cool_dude Posts: 124, Reputation: 9
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    #8

    Jan 25, 2007, 04:44 PM
    Yes but remember that -10/12 reduces to -5/6

    Good Job!
    Adderb's Avatar
    Adderb Posts: 11, Reputation: 1
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    #9

    Jan 25, 2007, 04:54 PM
    Great.. Thanks for all your help..
    avy's Avatar
    avy Posts: 3, Reputation: 1
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    #10

    Jul 6, 2008, 10:55 AM
    if the perimeter of the rectangle is t units and the area is 2t+5 squre units,what is the value of x?
    avy's Avatar
    avy Posts: 3, Reputation: 1
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    #11

    Jul 6, 2008, 10:58 AM
    Can anyone help me with my this que...
    avy's Avatar
    avy Posts: 3, Reputation: 1
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    #12

    Jul 6, 2008, 11:04 AM
    if the perimeter of the rectangle is t units and the area is 2t+5 squre units,what is the value of x?
    morgaine300's Avatar
    morgaine300 Posts: 6,561, Reputation: 276
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    #13

    Jul 6, 2008, 01:06 PM
    You should post your question under your own new thread. Your question has nothing to do with elimination, and the thread is also a year and a half old.
    COOLIOZ's Avatar
    COOLIOZ Posts: 1, Reputation: 1
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    #14

    Mar 29, 2009, 01:48 PM

    2x-3y=-11
    3x+4y=16
    DANNYSENDIN's Avatar
    DANNYSENDIN Posts: 1, Reputation: 1
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    #15

    Jul 29, 2009, 07:03 AM
    I got the answer is x= 3/6
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #16

    Jul 29, 2009, 10:39 AM

    Sigh COOLIOZ, have you read the previous posts? Especially that of morgaine?

    Quote Originally Posted by morgaine
    You should post your question under your own new thread. Your question has nothing to do with elimination, and the thread is also a year and a half old.
    DANNYSENDIN, your answer is wrong. X = 4/17.
    morgaine300's Avatar
    morgaine300 Posts: 6,561, Reputation: 276
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    #17

    Jul 30, 2009, 01:17 AM

    Yeah, thanks folks for wasting my time reading through this entire thread yet again.

    Sigh.
    kenzky's Avatar
    kenzky Posts: 1, Reputation: 1
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    #18

    Aug 2, 2010, 05:07 AM
    and substitute 11 in equation (1)

    5x-8y=25
    5(11)-8y=25
    -8y=25-55
    -8y=-30
    -8
    y = 3.75
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #19

    Aug 2, 2010, 10:46 PM

    People, read the previous posts please. Problem solved already.

    THREAD CLOSED
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