Question 321322
Hint: ALL vertical lines are of the form {{{x=k}}} where 'k' is some constant number. Ex: {{{x=2}}} and {{{x=12}}} are vertical lines. On the other hand, ALL horizontal lines are of the form {{{y=k}}} where 'k' is some constant number. Ex: {{{y=8}}} and {{{y=22}}} are horizontal lines.