For this case what you should know is that the slope of the line can be calculated as: Tan x = sin x / cos x The lines x = 2 and x = 3 have an angle of 90 degrees with respect to the x axis: Tan 90 = sin 90 / cos 90 = 1/0 = inf Therefore, both lines have a rate of change that tends to infinity. answer Both lines have the same slope (infinity) Both are greater than m = -1