7th grade math

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How would you solve the problem below using the subsitution method?


12x + 4 = 8y
y = x - 7


Please explain to me and help. If you could show all the steps, that would help a lot. Thank you.

  • 7th grade math -

    put the y equation in the first equation.

    12x+4=8*(x-7)
    12x+4=8x-56

    subtract 8x from each side, subtract 4 from each side.

    Then having solved for x, put that into the original y= equation

  • 7th grade math -

    Oohhh thank you soo much!!!

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