On a displacement-time graph, what does the slope of the line represent?

1. On a displacement-time graph, the y-axis records displacement and the x-axis records time. 2. Slope equals change in displacement divided by change in time. 3. That ratio is the definition of velocity. 4. So the slope of a displacement-time graph gives the velocity. 5. Acceleration would be the slope of a velocity-time graph, not displacement-time. _Source: Selina Concise Physics ICSE Class 9, Ch 2 'Motion in One Dimension' (aplustopper.com extract)_