PSAT Math Multiple-Choice Question 346: Answer and Explanation

Question: 346

What is the value of y - x, if 6x - 4y = 8 and 5y - 7x = 12?

• A. -8
• B. 4
• C. 12
• D. 20

Correct Answer: D

Explanation:

D

Difficulty: Medium

Category: Combination

Strategic Advice: When a question asks for a sum or difference of variables, consider solving by combination.

Getting to the Answer: Rearrange the equations to be in the same form, with the y terms before the x terms, and then add:

The correct answer is (D).