Govt school math

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X+y=18,2x+y=27

  • Govt school math -

    Solve the question by substitution method? Equation 1st x+y=18 equation 2nd 2x+y=27

  • Govt school math -

    subtract the first from the second ...

    2x+y = 27
    x + y = 18
    -----------
    x = 9

    sub into the 1st:
    9+y = 18
    y = 9

    so x=9 and y=9

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