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Systems of Two Linear Equations in Two Variables

SAT Math· difficulty 4/5

If x+y=5x + y = 5, y+z=7y + z = 7, x+z=6x + z = 6, what is x+y+zx + y + z?

  • A

    9

    check_circle
  • B

    12

  • C

    18

  • D

    6

Explanation

Adding all: 2(x+y+z)=182(x+y+z) = 18 → x+y+z=9x+y+z = 9.

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