6FUNCTIONS AND GRAPHS WITH TWO VARIABLES
So far, we've worked with equations and inequalities with one variable. We often work with equations with two variables. In this chapter, we explain why working with two variables is important in math and discuss different ways to represent mathematical relationships in two variables.
6.1 Functions and Function Notation
Have you ever used an electronic vending machine? You put in money, press a button or series of buttons, and the machine dispenses an item, such as a drink or snack. The item that comes out of the machine depends on what buttons you press. We can represent a vending machine's inputs (the buttons pressed to select items) and outputs (the items dispensed by the machines) with a table, ...
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