Linear Functions

SAT Math· difficulty 4/5

The average rate of change of f(x)=(2k1)x+3f(x) = (2k - 1)x + 3 between any two points is 55. What is kk?

  • A

    52\dfrac{5}{2}

  • B

    22

  • C

    72\dfrac{7}{2}

  • D

    33

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Explanation

Slope =2k1=5= 2k - 1 = 5, so k=3k = 3.

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