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Lines, Angles, and Triangles

SAT Math· difficulty 2/5

Two angles form a linear pair (lie on a straight line). If one angle is 5x5x and the other is 4x4x, what is the value of xx?

  • A

    10

  • B

    18

  • C

    20

    check_circle
  • D

    9

Explanation

A linear pair sums to 180°180°. So 5x+4x=180°5x + 4x = 180°, giving 9x=180°9x = 180°, so x=20x = 20.

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