Use the Rectangular Coordinate System: example 11.2

The coordinate values are the same for both points, but the $x$ and $y$ values are reversed. Let’s begin with point $(1,3).$ The $x\text{-coordinate}$ is $1$ so find $1$ on the $x\text{-axis}$ and sketch a vertical line through $x=1.$ The $y\text{-coordinate}$ is $3$ so we find $3$ on the $y\text{-axis}$ and sketch a horizontal line through $y=3.$ Where the two lines meet, we plot the point $(1,3).$

To plot the point $(3,1),$ we start by locating $3$ on the $x\text{-axis}$ and sketch a vertical line through $x=3.$ Then we find $1$ on the $y\text{-axis}$ and sketch a horizontal line through $y=1.$ Where the two lines meet, we plot the point $(3,1).$

Notice that the order of the coordinates does matter, so, $\left(1,3\right)$ is not the same point as $\left(3,1\right).$