Answer:
Slope: 0
Explanation:
m=(y2-y1)/(x2-x1) ==> (x1, y1) and (x2, y2) are given coordinates
m=slope
Given coordinates: (3,-3) and (18,-3) ==> (x1=3, y1=-3) and (x2=18, y2=-3)
m=(-3-(-3))/(18-3) ==> substitute known values
m=(-3+3)/15 ==> (subtracting by negative) == (adding by positive)
m=0/15
m=0
Slope: 0