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Let's start by marking the points in a coordinate plane.

Now we need to draw a line that goes through both points. We need to keep in mind that the line should continue before and after the points.

b

Now that we have the line drawn we can find its rate of change by determining the change in $x,$ $Δx,$ and change in $y,$ $Δy.$

The rate of change of the line can be determined by dividing the $Δy$ by $Δx.$ $rate of change=ΔxΔy $ In the graph we can see that $Δx=2$ and $Δy=2.$ Thus, the line's rate of change is $1.$