For example ... line graphs for temperature and humidity on top of each other. For this purpose, Excel lets you add a series of data to a chart and plot it on a second y-axis. A simple chart ...

Save guides, add subjects and pick up where you left off with your BBC account. Plot points with coordinates where \(x\) and \(y\) are equal. Three points are sufficient, but more can be plotted.

Save guides, add subjects and pick up where you left off with your BBC account. The graphs of \(y = 2x + 1\) and \(y = 2x - 2\) are shown below. The graph of \(y = 2x + 1\) crosses the \(y\)-axis ...