SAT Math Multiple Choice Practice Question 412: Answer and Explanation
If the perimeter of rectangle ABCD is equal to p, and x = y, what is the value of y in terms of p ?
Correct Answer: B
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.