Question 1205705
use given points  ({{{4}}},{{{5}}}) and ({{{6}}},{{{5}}}) to find a slope

{{{m=(5-5)/(6-4)=0/2=0}}}=> means we have horizontal line 

{{{y=b}}}....from the given points we see that y-intercept {{{b=5}}}

equation is
{{{y=5}}}

{{{ drawing( 600, 600, -10, 10, -10, 10, 
circle(4,5,.12), locate(4,5,p(4,5)),
circle(6,5,.12), locate(6,5,p(6,5)),
graph( 600, 600, -10, 10, -10, 10, 5,5)) }}}