Learning Objectives:

__Math Tutoring on Introduction to Functions of Several Variables__

A function is a function of two variables.

__Domain and Range:__

The **Domain** is the set of all possible values of ** ‘x’** and

The **Range** is the set of all possible values of ** ‘z’** from the

The **Graph **is the set of all possible points ** (x, y, z)** produced by the function in math tutoring. Geometrically, the

__Level Curve:__

**Level Curves** or **Contour Lines** are another way to represent a function **.**

By letting ** ‘z’** equal to some constant

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**Hook Questions:**

*1. **What is the Domain and Range of functions of two variables?*

*2. **What is Level Curve? Give some real life examples of Level Curves?*

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