Can somebody help me. Just number one is fine, I just want to know the concept so I can do the rest of the problems.

Answer:
Q1: m = 3/4
Step-by-step explanation:
Using the formula in the attached diagram,
Consider question 1
For A(1,1) and B(5,4)
x1 = 1, y1 =1, x2= 5, y2=4
hence slope m, = (4-1) / (5-1) = 3/4 (or 0.75 if needed in decimal)