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math

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solve using the substitution method:
8x+5y=-12
x=12-4y

  • math -

    x=12-4y

    8x+5y= -12

    8*(12-4y)+5y= -12

    8*12-8*4y+5y= -12

    96-32y+5y= -12

    96-27y= -12

    96+12=27y

    108=27y Divide with 27

    4=y

    y=4

    x=12-4y

    x=12-4*4

    x=12-16

    x= -4

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