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Systems of Two Linear Equations in Two Variables

SAT Math· difficulty 4/5

Lines y=mx+3y = mx + 3 and y=−2x+9y = -2x + 9 intersect at x=1x = 1. Find mm.

  • A

    3

  • B

    1

  • C

    4

    check_circle
  • D

    2

Explanation

At x=1x = 1, y=−2+9=7y = -2 + 9 = 7. So 7=m+37 = m + 3 → m=4m = 4.

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