Question 1171334
A horizontal line has slope zero since it does not rise vertically.

{{{y=a}}}

A horizontal line that passes through the point ({{{-2}}},{{{ 7}}}) will be:

{{{y=7}}}

{{{drawing ( 600, 600, -10, 10, -10, 10, 
circle(-2,7,.12),locate(-2,7,p(-2,7)),
graph( 600, 600, -10, 10, -10, 10, 7,7)) }}}