Linear functions SAT question

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

The function $f$ is defined by the equation $f (x) = 7 x + 2$ . What is the value of $f (x)$ when $x = 4$ ?

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ExplanationShow

The correct answer is $30$ . The value of $f (x)$ when $x = 4$ can be found by substituting $4$ for $x$ in the given equation $f (x) = 7 x + 2$ . This yields $f (4) = 7 (4) + 2$ , or $f (4) = 30$ . Therefore, when $x = 4$ , the value of $f (x)$ is $30$ .

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