Math

If 7x + 4y = 18 and 3x + y = -3, what is the value of x + y?
F. 9
G. 11
H. 12
J. 14
K. 15

  1. 👍 0
  2. 👎 0
  3. 👁 98
  1. 7x + 4y = 18
    3x + y = -3

    y = -3 -3x

    7x + 4(-3 -3x) = 18
    7x - 12 - 12x = 18
    -5x = 18 + 12
    -5x = 30
    x = -6

    3(-6) + y = -3
    y = 18 - 3
    y = 15

    15 + (-6) = ?

  2. 15 - 6 = 9

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  3. Yes.

  4. Thank you so much, Ms. Sue.

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    2. 👎 0
  5. You're very welcome.

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