Systems of Two Linear Equations in Two Variables

SAT Math· difficulty 2/5

Which system has infinitely many solutions?

  • A

    x+y=5x + y = 5 and x+y=6x + y = 6

  • B

    x+y=5x + y = 5 and 2x+2y=102x + 2y = 10

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  • C

    x+y=5x + y = 5 and 2xy=12x - y = 1

  • D

    x+y=5x + y = 5 and y=x+7y = -x + 7

Explanation

Second equation is twice the first → same line.

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