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24 January, 21:41

How do I solve x+y=1 and 5x-4y=-7?

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  1. 24 January, 23:27
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    Use substitution method:

    x + y = 1 - - > y = x - 1 (then plug in to other equation)

    5x - 4y = - 7 - - > 5x - 4 (x - 1) = - 7 - - >

    5x - 4x + 4 = - 7 - - > x = - 11 (then plug into one of original equations to find y)

    x + y = 1 - - > (-11) + y = 1 - - > y = 12
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