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substitution method

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I am burned out on math or just confused.

3x + 7y=10
x= 2-2y


A. Solution is an ordered pair
B. No solution

  • substitution method -

    this one is easy, just plug the second equation into the first

    3x + 7y = 10
    3(2-2y) + 7y = 10
    6 - 6y + 7y = 10
    y = 4

    now back into x = 2 - 2y
    x = 2 - 8 = -6

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