Question

Which equation represents a vertical line?

Answer 1

"x = a" represents a vertical line in the cartesian graph. I would need more information to help you

Answer 2

A. x=y + 2
B.y=x + 1
C. y=2
D.x=2

Answer 3

any straight line that has an undefined slope, that is \(m=\large \frac{\Delta y}{\Delta x} = \frac{y_2-y_1}{x_2-x_1}\), where \(x_2 = x_1 \)

Answer 4

so whats my answer

Answer 5

I gave you the general description based on slope, which is an expansion of what @perl already told you