# Lesson 6.1 Identifying and Representing Functions Answer Key

Function is a mathematical concept that deals with the relation between two or more variables. A function can be represented in a variety of ways, including equations, graphs, and tables. Understanding how to identify and represent functions is an important part of math, and lesson 6.1 serves to help students understand this concept.

## Types of Functions

There are a few different types of functions that can be identified and represented. The most common type is the linear function, which is represented by an equation of the form y = mx + b. Another type of function is the quadratic, which is represented by an equation of the form y = ax2 + bx + c. Polynomial functions are also common, and these are equations that involve terms that are multiples of the same variable, like y = a2x2 + bx + c. Finally, there are also exponential functions, which have an equation of the form y = abx.

## Identifying Functions

In order to identify a function, it is important to understand the given equation and determine if it meets the criteria for a function. Generally, a function has exactly one output value for each input value. This means that if the equation has multiple output values for a single input value, then it is not a function. Additionally, the equation must also follow certain rules, such as the fact that the output value must be related to the input value in some way. Once these criteria are met, then the equation can be identified as a function.

## Representing Functions

Once a function has been identified, it can be represented in a variety of ways. The most common way is to graph the equation on a coordinate plane. This gives a visual representation of the function and makes it easier to understand the relationship between the input and output values. Equations can also be represented in tables, which list the input and output values for a given function. Finally, equations can also be represented in words, which is often used to explain the relationship between the input and output values.

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In conclusion, lesson 6.1 helps students understand how to identify and represent functions. By recognizing different types of functions, understanding how to identify them, and knowing how to represent them, students can gain a better understanding of this mathematical concept. With this knowledge, students will be better prepared to solve equations and answer questions related to functions.