SAT Math Multiple Choice Practice Question 428: Answer and Explanation

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Question: 428

11. If x + y = z and x = y, then all of the following are true EXCEPT

A. 2x + 2y = 2z
B. x - y = 0
C. x - z = y - z
D. x =
E. z - y = 2x

Correct Answer: E

Explanation:

E With algebraic answer choices, you should plug in numbers. Let's let x = y = 2, which makes z = 4. Plugging these values into the choices, you'd get the following:

(A) 2(2) + 2(2) = 2(4) [Yes]

(B) 2 – 2 = 0 [Yes]

(C) 2 – 4 = 2 – 4 [Yes]

(D) 2 - [Yes]

(E) 4 – 2 = 2(2) [No]

The correct answer is E. Don't forget the EXCEPT!

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