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Nonlinear Functions

SAT Math· difficulty 3/5

The graph of y=f(x)y = f(x) is vertically stretched by a factor of 3. Which equation represents the new graph?

  • A

    y=f(3x)y = f(3x)

  • B

    y=f(x/3)y = f(x/3)

  • C

    y=f(x)+3y = f(x) + 3

  • D

    y=3f(x)y = 3f(x)

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Explanation

A vertical stretch by factor aa multiplies the output: y=3f(x)y = 3f(x).

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