Question

is the graph of this equation a horizontal or vertical line? x = 9 horizontal line vertical line submit

Explanation:

Step1: Recall line equation types

Horizontal lines have the form \( y = k \) (constant \( y \), varying \( x \)). Vertical lines have the form \( x = k \) (constant \( x \), varying \( y \)).

Step2: Analyze \( x = 9 \)

The equation \( x = 9 \) means \( x \) is always 9, while \( y \) can be any real number. This matches the vertical line form.

Answer:

vertical line