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    ciera16's Avatar
    ciera16 Posts: 1, Reputation: 1
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    #1

    Feb 10, 2011, 04:55 PM
    x-4y=11
    How do you work out :
    x-4y=11
    5x-7y=-10
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Feb 10, 2011, 10:34 PM

    The shortest way would be a substitution.

    1. Make x the subject of formula in the first equation.
    2. Substitute this into the second formula.
    3. Solve for y.
    4. Use y to get x.
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