Question

what is the equation of the line that contains the point (9, 2) and has an undefined slope?
a ( x = 2 )
b ( y = 2 )
c ( x = 9 )
d ( y = 9 )

Explanation:

Step1: Recall undefined slope lines

Lines with undefined slope are vertical, with equation $x = a$ where $a$ is a constant.

Step2: Match x-coordinate of given point

The line passes through $(9, 2)$, so $a$ equals the x-coordinate of the point, which is 9. Thus the equation is $x = 9$.

Answer:

C. $x = 9$