If you are using made up data in your class, I would like to ask one simple little question "WHY?". There are massive amounts of real data available, and also many opportunities for students to create their own data.
Made up data creates pseudo-context questions, meaningless answers, and most likely confusion. Real-life data provides the students with the ability to develop, learn, and apply their understanding of past lessons into an actual context. When you use real data, you show the true power of mathematics; making the unknown known.
As you can see, the numbers are meaningless and create zero motivation to solve the problem.
Here is how I teach regressions currently:
The discussion which was created was truly inspiring to me as a teacher. Another teacher, who was walking by my class, also entered into the discussion explaining how exponential growth applies to investing money. If the numbers of poverty did not shock them, I also showed them pictures, some which are below.
I promote collaboration and discussion in my class, and when I turned off the photos you could have heard a pin drop.