How does the graph of the line y=2/3x+1 differ from the graph of the line y=3x+1?

a) y=2/3x+1 is steeper than y=3x+1
b) y=3x+1 is steeper than y=2/3x+1
c) y=2/3x+1 and y=3x+1 don't differ
d) The y intercept of y=3x+1 is 2 1/3 units higher than the y intercept of y=2/3x+1
e) The x intercept of y=3x+1 is 2 1/3 units to the right of the x intercept of y=2/3x+1

What exactly does slope mean?