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Linear Functions

SAT Math· difficulty 3/5

If f(x)=5x+2f(x) = 5x + 2, what is f−1(17)f^{-1}(17)?

  • A

    87

  • B

    15

  • C

    5

  • D

    3

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Explanation

f−1(x)=(x−2)/5f^{-1}(x) = (x-2)/5. f−1(17)=15/5=3f^{-1}(17) = 15/5 = 3.

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