PSAT Math Multiple-Choice Question 294: Answer and Explanation
Question: 294
If , what is the value of
?
- A.
- B.
- C.
- D. 1
Correct Answer: A
Explanation:
A
Difficulty: Medium
Category: Solving Equations
Strategic Advice: You have two variables, but only one equation, so solving for each variable will not be possible. Instead, pick numbers for x and y that will make the equation true.
Getting to the Answer: Pick a simple number for x and solve for y. Hopefully, y will also be easy to work with so you can plug them into the expression you are trying to find. Say x = 4; this gives , or
Multiplying both sides by 2 y gives 12 = 12 y, so y = 1. Both numbers are very manageable, so plug them into the expression
. This yields
, which is (A).
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