The same is the case with line charts. The values are plotted across the y-axis and the x-axis is used to mark the progression. In the case of a scatter plot, whether you use it simply with ...

Draw the graph of \(y = 3x - 1\). If you recognise this as a straight line then just choose two ‘easy’ values of \(x\), work out the corresponding values of \(y\) and plot those points.