For the first line:
m = (-5 - 0) / (0 - 2.5) = 2
For the second line:
From the given equation,
m = 2
For the third, using the given coordinates (-1,3) (1,7)
m = (7 - 3) / (1 - (-1)) = 2
Therefore, all the slopes of the lines are 2 and none of them have the smallest slope compared to the others.