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Systems of Two Linear Equations in Two Variables

SAT Math· difficulty 2/5

Solve the system: 2x+y=112x + y = 11 and x−y=1x - y = 1. What is the value of yy?

  • A

    3

    check_circle
  • B

    4

  • C

    1

  • D

    5

Explanation

Adding: 3x=123x = 12, so x=4x = 4. Then y=x−1=3y = x - 1 = 3.

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