The unit rate refers to the slope of the line which passes through the given points. So, we need to find the slope with the following formula
[tex]m=\frac{y_2-y_1}{x_2-x_1}[/tex]We are going to use points (4,5) and (8,10).
[tex]m=\frac{10-5}{8-4}=\frac{5}{4}[/tex]Therefore, the unit rate is 5/4.
An interpretation of this unit rate is: while the vertical coordinate varies 5 units, the horizontal coordinate varies 4 units.
