i cant exactly help with this, but you can input each equation into the website desmos.com to get the graph for it to help compare with the other functions. as for the fourth function, the equation would be y=3x+1. the slope for function 2 is 5, function 3, -4, and function 1, -1. the slope for the fourth would be 3. sorry if this answer is scattered all over the place but i hope it helped!!
