Linear functions SAT question

Math · Algebra · Easy · Answer it here, explanation included.

The function $f$ is defined by $f (x) = 4 x$ . For what value of $x$ does $f (x) = 8$ ?

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ExplanationShow

The correct answer is $2$ . Substituting $8$ for $f (x)$ in the given equation yields $8 = 4 x$ . Dividing the left- and right-hand sides of this equation by $4$ yields $x = 2$ . Therefore, the value of $x$ is $2$ when $f (x) = 8$ .

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