Digital PSAT Math Practice Question 325: Answer and Explanation

Question: 325

A function never intersects the y-axis. Which of the following could be an equation of the function?

• A. y = 2x– 5
• B. y = 4
• C. x = 36
• D. y = x

Correct Answer: C

Explanation:

(C)$x=36$ does not have a y-intercept, because it runs parallel to the y-axis. Therefore, this equation never intersects the y-axis. Here is a graph of $x=36$:

All of the other choices intersect the y-axis one time, because they have a y-value when $x=0$.