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Nonlinear Functions

SAT Math· difficulty 4/5

The function y=2xy = 2^x is reflected over the y-axis. Which equation results?

  • A

    y=−2−xy = -2^{-x}

  • B

    y=(1/2)−xy = (1/2)^{-x}

  • C

    y=−2xy = -2^x

  • D

    y=2−xy = 2^{-x}

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Explanation

Reflection over the y-axis replaces xx with −x-x: y=2−xy = 2^{-x}.

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