Tell whether the set of ordered pairs {(1,1), (3,3), (5,9), (8,13)} satisfies a linear function. explain

Hello! In order to find a linear function without graphing it, we can see if the x-values (domain) has more than one value of y (range) out of this set of ordered pairs. Those ordered pairs represent a linear function, because each x-value does not have more than 1 y-value. Therefore, those points satisfies a function.