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**3/22 Functions**

*Read the following SAT question and then select your answer.*

*Remember to follow the Knowsys Method: Read carefully, identify the bottom line, and assess your options. After you ask, "What could I do?" and "What should I do?" attack the problem, then loop back to check whether you answered the question correctly. Finally, take a look at the answer choices and select the correct one.*

*The graph of*

**y=f(x)**is shown above. If , and if**(t,v)**is on the graph of**f**, which of the following must be true?*A glance at the answer choices shows that they all have*

*v*, so

*v=?*will do for an imperfect bottom line. Now look at the question again. If

*t*is somewhere from

*0*to

*5*, what does that say about

*v*? Note that

*t*is the

*x*value, and

*v*is the

*y*value, so you need to focus on the part of the graph from

*x=0*to

*x=5*. In that range, the smallest

*y*value is

*5*and the greatest is

*10*. Now look at the answer choices.

The answer is D.

On sat.collegeboard.org, 56% of responses were correct.

For more help with math, visit www.myknowsys.com!