PSAT Math Multiple-Choice Question 336: Answer and Explanation

Question: 336

What is the y-coordinate of the solution to the system of equations shown?

• A. -1
• B. 0
• C.
• D. 5

Correct Answer: A

Explanation:

A

Difficulty: Easy

Getting to the Answer: Quickly compare the two equations. The system is already set up perfectly to solve using combination, so add the two equations to cancel -4y and 4y. Then, solve the resulting equation for x. Remember, the question asks for the y-coordinate of the solution, so you will need to substitute x back into one of the original equations and solve for y:

Thus, (A) is correct.