Question 129804
A line perpendicular to the y-axis is parallel
to the x-axis. Since the slope is defined as
(change in y)/(change in x), the slope is zero.
There is never any change in y no matter what 
the change in x is.
The general equation for a straight line is:
{{{y = mx + b}}} where {{{m}}} is the slope
and {{{b}}} is the y-intercept.
I just said {{{m=0}}} for the line perpendicular
to the y-axis, so
{{{y = 0*x + b}}}
{{{y = b}}}
The problem says the y-intercept is -5
{{{y = -5}}} answer