What is the slope and y-intercept of the line #x=-6#?
The line is vertical.
It does not have a y-intercept at all.
The gradient is undefined (infinite).
This vertical line does not cross the
It does not cross the y-axis at all, so there is no y-intercept.
Lines which are vertical are said to have an infinite or undefined gradient.
The definition of gradient is
As there is no change in the x-values the denominator would be 0.
Vertical lines are only ones which cannot be written in the standard form of