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Linear Functions

SAT Math· difficulty 3/5

A linear function ff satisfies f(1)=4f(1) = 4 and f(5)=16f(5) = 16. What is f(0)f(0)?

  • A

    4

  • B

    3

  • C

    1

    check_circle
  • D

    0

Explanation

Slope =(16−4)/(5−1)=3= (16-4)/(5-1) = 3. f(x)=3x+bf(x) = 3x + b. From f(1)=4f(1) = 4: b=1b = 1. So f(0)=1f(0) = 1.

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