Answer:
slope=0 
Explanation:
Hi there!
We're given a graph with a line and two marked points on the graph: (-1,3) and (3,3) 
the formula given for slope calculated from two points is (y2-y1)/(x2-x1), where (x1,y1) and (x2,y2) are points
we have our two points: (-1,3) and (3,3) and we can label them: 
x1=-1
y1=3
x2=3
y2=3
now substitute into the formula
note: Remember the formula shows SUBTRACTION, even though we have NEGATIVE numbers. When we simplify, we'll add the numbers. 
slope=(3-3)/(3--1)
simplify
slope=0/4
divide 
slope=0
Hope this helps!