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Linear Functions

SAT Math· difficulty 4/5

For f(x)=(k+1)x−5f(x) = (k+1)x - 5, the average rate of change over any interval is −3-3. What is kk?

  • A

    −4-4

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  • B

    −3-3

  • C

    22

  • D

    −2-2

Explanation

Slope =k+1=−3⇒k=−4= k + 1 = -3 \Rightarrow k = -4.

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