As an example, we will create the exercise:

**Find the formula of the straight line through the points (0,4) and (2,8).**

- Create a new exercise and enter y=a x+b as task for the solution step.
- Create a new step with the following settings
- name ‘a’
- description ‘the slope’
- task simplify (8-4)/2

- Create another step with settings:
- name is ‘b’
- description ‘the offset’
- task simplify 4

The resulting interaction behaves as follows:

Note the following:

- variables
- the student input y = a x+b is not accepted

Let’s now make variables a and b so-called student variables.

Check the box **student variable** for both steps in the step menu (by clicking the triangle next to the step name).

Run the exercise again and see how variable a and b show up in the worked-out solution and how they can be used by the student.

Note that a student is now able to use the step names as variables, both in the student input for the steps as well as for the definition of the solution step.

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