Linear Equations in One Variable

SAT Math· difficulty 4/5

The lines y=2x+3y = 2x + 3 and y=x+ky = -x + k intersect at (2,7)(2, 7). What is the value of kk?

  • A

    9

    check_circle
  • B

    9-9

  • C

    5-5

  • D

    5

Explanation

Substitute (2,7)(2, 7) into the second: 7=2+k7 = -2 + k, so k=9k = 9.

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