SAT Linear functions Practice Question 12 (Medium)

Math · AlgebraMedium

The function $f$ is defined by $f(x) = ax + 7$ , where $a$ is a constant. If $f(3) = 19$ , what is the value of $f(-2)$ ?

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Answer: -1

From $f(3) = 3a + 7 = 19$ , we get $3a = 12$ and $a = 4$ . Then $f(-2) = 4(-2) + 7 = -8 + 7 = -1$ .

Stopping after finding $a = 4$ answers a different question.

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