Direct variation functions are quite difficult for many students, even after they have mastered "y = mx + b," which always strikes me as a surprise. No matter how often I tell that kids that b = 0, they seem to freak out about the whole process of setting up an equation, solving for m, (or k), and then going back and writing the equation of the line to make predictions about a situation.
I wrote this worksheet to give them extra practice.
I use this activity within cooperative groups, and I circulate to make sure they are getting the purpose of the questions.
The file includes spiral review problems.
For this worksheet, I expect students to show their work on a separate sheet of paper.
Please download the pdf preview file first, so you can see exactly what's included; the product file is a word document, which you may personalize for your students.