Wednesday
April 16, 2014

Homework Help: Algebra

Posted by Lissa on Friday, June 26, 2009 at 12:27pm.

Today I did a practice SAT problem.

If the function is defined by (x) = 2x + 3, and if (a) = 11, what is the value of a?

A. 4
B. 7
C. 11
D. 17
E. 25

This is the correct answer and the explanation

Here's Why:

If the function is defined by (x) = 2x + 3, and (a) = 11, then (a) = 2a + 3 = 11. Therefore, a = 11-3/2=4.

I don't understand the rules for functions. Why do you divide 11-3 by 2? Is there a specific formula you follow for them? Thanks for your help!

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