Answer:
Alisha might have not taken respective input values with the output values and the correct slope is 3.
Step-by-step explanation:
The general form of a linear relationship is given by the equation

Here m is the rate of change of the linear relationship which is calculated as:

Change in y is given by the difference of two outputs and x is given by difference of two inputs
So taking the set of outputs and inputs
(1,2) and (2,5)

Alisha might have not taken respective input values with the output values and the correct slope is 3.