Important Notice:

Practice-It will be discontinued as of November 1st, 2024. After this date, the website will remain online for a transitional period, but login will be restricted to University of Washington NetID authentication. This marks the next phase towards the platform's full retirement. Thank you for your use and support of the application over the years.

If you are looking for an alternative, a similar tool, CodeStepByStep, was developed independently by the original author of Practice-It, and is available at codestepbystep.com**

logo Practice-It logo

Main Page → Problems → Solve a Problem

BJP5 Exercise 8.15: getSlopeLine

Author: Marty Stepp (on 2019/09/19)

Add the following method to your Line class from the previous exercise: 

public double getSlope()

Returns the slope of this line. The slope of a line between points (x1, y1) and (x2, y2) is equal to (y2 - y1) / (x2 - x1). If the two points have the same x-coordinates, the denominator is zero and the slope is undefined, so you should throw an IllegalStateException in this case.

(You don't need to write the class header or declare the fields; assume that this is already done for you. Just write the method's complete code in the box provided.) See the previous exercise for a description of the Line class and its public members.

Type your solution here:


This is a partial class problem. Submit code that will become part of an existing Java class as described. You do not need to write the complete class, just the portion described in the problem.

You must log in before you can solve this problem.


Log In

If you do not understand how to solve a problem or why your solution doesn't work, please contact your TA or instructor.
If something seems wrong with the site (errors, slow performance, incorrect problems/tests, etc.), please

Is there a problem? Contact a site administrator.