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Linear functions SAT question
Math · Algebra · Medium · Answer it here, explanation included.
For the function f defined above, what is the value of 
?
ExplanationShow
Choice B is correct. The value of can be calculated by finding the values of 
and 
. The value of can be found by substituting 9 for x in the given function: 
. This equation can be rewritten as 
, or 4. Then, the value of can be found by substituting 1 for x in the given function: 
. This equation can be rewritten as 
, or 2. Therefore, 
, which is equivalent to 2.
Choices A, C, and D are incorrect and may result from incorrectly substituting values of x in the given function or making computational errors.
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