First, let's find the slope of the line segment that passes through the given poins (-5,1) and (2,1). (Note: Please use parentheses here.
1-1
m = -------------- = 0. The slope of this segment is zero; the segment is horiz.
2-(-5)
The desired line is therefore horiz. It passes thru (-5,1) and (2,1). Note that the y-coordinates are both 1. Thus, the equation of this horiz. line is y = 1.