Question 269093
the slope(m) of a line passing through two points (x1,y1) and (x2,y2) is given by 

     slope m = (y2-y1)/(x2-x1) 

so, slope of the line through the two points (1,-1) and (4,-1) is 
slope = (-1+1)/(4-1) = (0)/(3) 
so slope = 0    answer