Digital PSAT Math Practice Question 335: Answer and Explanation

Question: 335

The following equations could all have the constant k equal zero and have a defined solution EXCEPT

• A. kx = 0
• B. 3 = k – x
• C. 4k + x = 7
• D. $\frac{2}{k}=x$

Correct Answer: D

Explanation:

(D) $2/k=x$ is undefined if $k=0$. Dividing by 0 results in an undefined solution. All of the other equations have a solution for x when $k=0$.