Math

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x+y=20
x=y-4
Please help me solve each system of equations and show your work thanks

  • Math -

    use substitution, sub the 2nd into the 1st

    x+y = 20
    (y-4) + y = 20
    2y = 24
    y = 12
    back into x = y-4
    x = 12-4 = 8

    x = 8, y = 12

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