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12 December, 16:31

Whats the solution for 7x-y=7 x+2y=6

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  1. 12 December, 18:09
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    Multiply the first equation by 2 to then use elimination by adding the 2 equations.

    So, 14x-2y=14

    +. x+2y=6

    Equals 15x=20 so x=20/15=4/3

    Plug in to first equation to get y

    7 (4/3) - y=7

    28/3-y=7

    28/3-y=21/3

    So y=7/3

    Plug both x and y into second equation to check

    4/3+2 (7/3) =

    4/3+14/3=18/3=6 it works

    So x=4/3, y=7/3
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