Question

How do i write the equations for the vertical and horizontal lines passing through point (2,1)

Answer 1

f(x) = 2 or y = 2
x = 1

Answer 2

Vectical: x=2
Horizontal y=1

Answer 3

If a vertical line must pass through the point (x1, y1), then the equation of this horizontal line must be x = x1

So the vertical line is x = 2


If a horizontal line must pass through the point (x1, y1), then the equation of this horizontal line must be y = y1


So the horizontal line is y = 1