SAT Linear functions Practice Question 3 (Easy)

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Math · AlgebraEasy

The function $g$ is defined by $g(x) = -2x + 9$ . If $g(a) = 1$ , what is the value of $a$ ?

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Answer: 4

Set $-2a + 9 = 1$ . Subtract 9: $-2a = -8$ . Divide by $-2$ : $a = 4$ .

Computing $g(1) = 7$ instead of solving $g(a) = 1$ is a common mix-up.

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