Question 960156
Horizontal lines have the form, {{{y=c}}} where {{{c}}} is a constant.
Vertical lines have the form, {{{x=c}}} where {{{c}}} is a constant.
{{{Ax+By=C}}}
If {{{A=0}}} then,
{{{By=C}}}
{{{y=C/B}}} Horizontal line
.
.
.
If {{{B=0}}} then,
{{{Ax+0y=C}}}
{{{Ax=C}}}
{{{x=C/A}}} Vertical line