# 11.2.1 Introduction to 3D

- Author:
- Claire Verti

## Investigate the figure below. Try typing different equations and ordered pairs in the input on the left. Try rotating the figure with your mouse. Can you zoom in? Zoom out?

## 1. Notice-Wonder

What do you notice? What do you wonder?

## 2. Reset the image above by clicking on the "double-arrow circle" in the top right corner.

Type (1,3,2) in the input box on the left. What happens?

## 3. (1,3,2)

What do you think the red line represents? Blue line? Green line? How do you know?

## 4. Type "2x-y+z=1" into the input line.

What do you see? What does this represent?

## 5. Solutions & Non-Solutions

Is (1,3,2) a solution to 2x-y+z=1? How do you know? How can you explain using the graph? How can you explain without the graph?