Plotting a graph takes time. Often mathematicians just want to know the key features. These are: shape, location and some key points (such as where the graph crosses the axes or turning points).

from 0 to 10 s is 0.7 m/s. Look at this distance-time graph for a car travelling along a road and answer the following questions. Go to 4 seconds on the x-axis. Go vertically up until you meet the ...