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    robinsonangela1's Avatar
    robinsonangela1 Posts: 2, Reputation: 1
    New Member
     
    #1

    Jun 8, 2008, 05:05 PM
    substitution method
    I am taking Algebra 1, need help with the following problems.

    1. x = 4-4y
    -X + 2y = 2

    2. 4X + 2y=4
    3X + y = 4



    Thanks
    morgaine300's Avatar
    morgaine300 Posts: 6,561, Reputation: 276
    Uber Member
     
    #2

    Jun 8, 2008, 05:38 PM
    First, please see our guidelines for posting homework problems:

    https://www.askmehelpdesk.com/math-s...-b-u-font.html

    You should show us that you've at least made some type of attempt at doing your own work.

    But here is an example I did a while back on another post:
    https://www.askmehelpdesk.com/math-s...on-191151.html
    Look this over and then see if you can at least make an attempt at your problems. You can submit those attempts for someone to check, or ask about what part you don't understand.
    morgaine300's Avatar
    morgaine300 Posts: 6,561, Reputation: 276
    Uber Member
     
    #3

    Jun 8, 2008, 08:17 PM
    You can't substitute back into the same equation because you can't solve it. You'll just end up with 0 = 0.
    donf's Avatar
    donf Posts: 5,679, Reputation: 582
    Printers & Electronics Expert
     
    #4

    Jun 9, 2008, 06:01 AM
    Absoultley!

    So with X=0, solve for "Y"

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