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Linear Functions

SAT Math· difficulty 3/5

Let f(x)=ax+bf(x) = ax + b. Given f(1)=5f(1) = 5 and f(3)=13f(3) = 13, find f(0)f(0).

  • A

    11

    check_circle
  • B

    00

  • C

    33

  • D

    22

Explanation

Slope a=(13−5)/2=4a = (13-5)/2 = 4. f(1)=4+b=5f(1) = 4 + b = 5, so b=1b = 1. f(0)=1f(0) = 1.

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