Question 979882
With a horizontal line, the y-co-ordinate never
changes no matter what {{{ x }}} is.
So, although you are given the point ( -7,-2 ),
in fact this line goes through ( x, -2 ) no matter
what you plug in for {{{ x }}}.
The slope for a horizontal line is zero, so in the 
slope-intercept form, {{{ y = m*x + b }}}, {{{ m = 0 }}}
so you have:
{{{ y = 0*x + b }}}
{{{ y = b }}}
{{{ y }}} = the y-intercept which is ( 0,-2 )
( because {{{ x }}} can take any value, including {{{ x=0 }}} )
So, {{{ y = -2 }}} is the answer