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    melissapetrey's Avatar
    melissapetrey Posts: 2, Reputation: 1
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    #1

    Dec 22, 2009, 05:23 PM
    need help with x-4y=-7 and 7x-5y=20
    The solution to the system of equations by the substiution method.
    bones252100's Avatar
    bones252100 Posts: 253, Reputation: 29
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    #2

    Dec 22, 2009, 07:52 PM

    Add 4y to both sides of the first equation to gain the value of X. Substitute that value of X into the 2nd equation. Solve the final value of Y from the 2nd equation. This value of Y can now be subsituted into the first equation to gain the final value of X. Didn't you listen today?
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