Question 1154518
the slope of the line:

{{{m=(y[2]-y[1])/(x[2]-x[1])}}}

if the line passing through the points ({{{-3}}}, {{{4}}}) and ({{{5}}}, {{{4}}}), we have

{{{m=(4-4)/(5-(-3))}}}

{{{m=0/8)}}}

{{{highlight(m=0))}}}=> we have a horizontal line of form {{{y=a}}}, in your case {{{y=4}}}


{{{drawing ( 600, 600, -10, 10, -10, 10,
circle(-3,4,.12),circle(5,4,.12), locate(-3,4.6,p(-3,4)), locate(5,4.6,p(5,4)),
graph( 600, 600, -10, 10, -10, 10, 4, 4)) }}}