Answer:
It means that it has no slope, and it is sort of a vertical asymptote, because the Y value increases but the X value stays the same, there is no change in the graph.
Explanation:
X=3 if we use the points (3,1) and (3,2), and use the slope equation we get:
m=y2-y1/x2-x1
m=2-1/3-3
m=1/0
no slope