How many solutions does this system have? y=-3x -9x-4y=21

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How many solutions does this system have? y=-3x -9x-4y=21

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Piper 5 hours 2021-11-25T19:16:01+00:00 1 Answer 0 views 0

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    2021-11-25T19:17:16+00:00

    Step-by-step explanation:

    -9x-4(-3x)=21

    -9x+12x=21

    3x=21

    x=7

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45:7+7-4:2-5:5*4+35:2 =? ( )