# SAT Math Multiple Choice Practice Question 412: Answer and Explanation

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**Question: 412**

**16.**

If the perimeter of rectangle *ABCD* is equal to *p*, and *x* = *y*, what is the value of *y* in terms of *p* ?

A.

B.

C.

D.

E.

**Correct Answer:** B

**Explanation:**

**B** Plug in! Because the values you choose for *x* and *y* must satisfy the equation, let *x* equal 6 and *y* equal 9. The perimeter *p* would then equal 6 + 6 + 9 + 9, or 30. The target is *y*, which is equal to 9. Plugging in 30 for *p* in each of the choices, you'd get B as the answer. Although some of you might have answered this question correctly by using algebra, doing so might have caused you to make a mistake without realizing it. Trust us. Plugging In is always the safer method for this type of problem. The Joe Bloggs choice, by the way, was C.