**Learning objectives**

- Master linear functions of 2 variables
- Explore representations of functions of 2 variables by graphs, tables, and contour diagrams using Mathematica

**Before class**

- Read Hughes-Hallett sections 12.1-4.
- Ponder Hughes-Hallett problems 12.1: 1, 15, 23, 24, 29, 30; 12.2: 1, 2, 14, 23, 27; 12.3: 7, 15, 16, 17, 18, 22, 29; 12.4: 1–8, 16, 22, 24.
- Complete HW1 on WeBWork
- Download Mathematica onto your laptop (so we can use it in class)
- Post to Piazza

**In class**

- Examine a few contour diagrams in real life. For homework, find a link to another online contour diagram that you like, and post it on Piazza, with a brief description of the function and variables.
- Work selected problems
- Activity: visually representing 2-variable functions with Mathematica