Plotted points on a graph are referred to as coordinates ... will either be a horizontal or vertical line. All the points on the horizontal line below have a y-coordinate of \(4\), so you can ...

Draw the graph of \(x = 3\). Mark some points on a grid which have an \(x\)-coordinate of 3, such as (3, 0), (3, 1), (3, -2). The points lie on the vertical line \(x = 3\). If you recognise that ...