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Solve by substitution method
What is the solution of the method?

  • math -

    Those are two separate equations. You should have typed:

    9x + 6y = 21
    -9x + y = 35

    You can either add them, or SUBSTITUTE y-35 for 9y in the first equation. Either way, you get
    7y = 56
    y = 8
    9x + 48 = 21
    x = -3

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