Graph plotting

This YouTube shows how to plot the graph of a linear equation (= straight line).

Have a go at plotting the line before watching the video
1. (a) Plot the graph y = 2x + 1
(b) Use your graph to find y when x = 2.5
(c) From the graph find the value of x when y = 4.

A ditty to recall averages

Hey diddle diddle the median's the middle
You add then divide for the mean
The mode is the one you see the most
The range is the one in between!