The greatest slope is the steepest one
The slopes of green and orange lines are positive because they make acute angles with the positive part of the x-axis
The slopes of the blue and red lines are negative because they make obtuse angles with the positive part of the x-axis
Then m1 and m2 greater than m3 and m4
Since the green line is stepper more than the orange line, then
m1 > m2
For the negative numbers, the greatest number is the smallest
Since the blue line is steeper than the red line, then its slope is smaller than the slope of the red line
m3 > m4
Then the slopes in descending order are m1, m2, m3, m4