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Linear Functions

SAT Math· difficulty 2/5

The function ff is defined by f(x)=5−2xf(x) = 5 - 2x. What is f(3)+f(−1)f(3) + f(-1)?

  • A

    2

  • B

    8

  • C

    0

  • D

    6

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Explanation

f(3)=5−6=−1f(3) = 5 - 6 = -1 and f(−1)=5+2=7f(-1) = 5 + 2 = 7. Sum: 66.

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