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Nonlinear Functions

SAT Math· difficulty 3/5

Which equation represents an exponential function with horizontal asymptote y=−2y = -2?

  • A

    y=2x+2y = 2^x + 2

  • B

    y=−2⋅2xy = -2 \cdot 2^x

  • C

    y=2x−2y = 2^{x-2}

  • D

    y=2x−2y = 2^x - 2

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Explanation

Subtracting 2 from 2x2^x shifts the asymptote to y=−2y = -2.

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