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Solve the system of equations by the substitution method?

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1/4x+2/3y=-5/4

3x-y=12

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  1. You wanna get y by itself on the second equation so you can subsitute it into the first equation.

    3x-y=12

    -y=-3x+12

    y=3x-12

    Now Subsitute

    1/4x+2/3(3x-12)=-5/4

    Multiply everything by 12

    3x+8(3x-12)=-15

    3x+24x-96=-15

    27x-96=-15

    27x=81

    x=3

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