Question

Write the equation of the vertical line passing through the point (3, 1).

Answer 1

a vertical line is in the form of "x = c" where c is just a number... it is a line where all points on the line have the same x value, c.

So here, your line must go through a point with x value of 3, right?

does that give you any ideas?

Answer 2

Ohh I get it so its c=3 right ?

Answer 3

no, c was just an example of a number. But you were on the right track.

It is x = 3.... all points up and down that vertical line have different y values, but they all have x = 3 as the x coordinate.

Answer 4

So a vertical line through a point like (4,10) would have all x values equal to 4... that line would be x = 4.

Unlike sloping lines which have equations like y = mx + b, vertical lines look like "x = some number"

Answer 5

ohh okay thank you :)

Answer 6

glad to help :) Hope it makes sense now.

Btw, horizontal lines are also "weird" like that...
a horizontal line equation will be like y = 2 (runs horizontally at y = 2)
or y = -6 (horizontal line at y = -6)