## What are features of a function?

Key features include: intercepts; intervals where the function is increasing, decreasing, positive, or negative; relative maximums and minimums; symmetries; end behavior; and periodicity.

## What are the six key features you look for in a function?

Key features include: intercepts; intervals where the function is increasing, decreasing, positive, or negative; relative maximums and minimums; symmetries; end behavior; and periodicity. Relate the domain of a function to its graph and, where applicable, to the quantitative relationship it describes.

## What is a mathematical function?

Function, in mathematics, an expression, rule, or law that defines a relationship between one variable (the independent variable) and another variable (the dependent variable). Functions are ubiquitous in mathematics and are essential for formulating physical relationships in the sciences.

## What makes a function function?

A relation from a set X to a set Y is called a function if each element of X is related to exactly one element in Y. That is, given an element x in X, there is only one element in Y that x is related to. This is a function since each element from X is related to only one element in Y.

## What is a function rule?

A function rule describes how to convert an input value (x) into an output value (y) for a given function. An example of a function rule is f(x) = x^2 + 3.

## How do you describe a function?

A function is a relation in which each possible input value leads to exactly one output value. We say “the output is a function of the input.” The input values make up the domain, and the output values make up the range.

## What is a function in your own words?

more A special relationship where each input has a single output. It is often written as “f(x)” where x is the input value. Example: f(x) = x/2 (“f of x equals x divided by 2”)

## What are 5 ways to represent a function?

Key Takeaways
• A function can be represented verbally. For example, the circumference of a square is four times one of its sides.
• A function can be represented algebraically. For example, 3x+6 3 x + 6 .
• A function can be represented numerically.
• A function can be represented graphically.

## How do you explain if a graph is a function?

Use the vertical line test to determine whether or not a graph represents a function. If a vertical line is moved across the graph and, at any time, touches the graph at only one point, then the graph is a function. If the vertical line touches the graph at more than one point, then the graph is not a function.

## How can you say that a graph is a function?

Inspect the graph to see if any vertical line drawn would intersect the curve more than once. If there is any such line, the graph does not represent a function. If no vertical line can intersect the curve more than once, the graph does represent a function.

## How do you write a function?

You write functions with the function name followed by the dependent variable, such as f(x), g(x) or even h(t) if the function is dependent upon time. You read the function f(x) as “f of x” and h(t) as “h of t”. Functions do not have to be linear. The function g(x) = -x^2 -3x + 5 is a nonlinear function.

## Whats a function and not a function?

A function is a relation between domain and range such that each value in the domain corresponds to only one value in the range. Relations that are not functions violate this definition. They feature at least one value in the domain that corresponds to two or more values in the range.

## Is a circle a function?

No, a circle is a two dimensional shape. No. The mathematical formula used to describe a circle is an equation, not one function. For a given set of inputs a function must have at most one output.

## Is a line a function?

If any vertical line intersects a graph more than once, the relation represented by the graph is not a function. Notice that any vertical line would pass through only one point of the two graphs shown in parts (a) and (b) of Figure 13. From this we can conclude that these two graphs represent functions.

## Are ellipses functions?

An ellipse is not a function because it fails the vertical line test.

## Is a straight line a function?

1 Answer. No, every straight line is not a graph of a function. Nearly all linear equations are functions because they pass the vertical line test. The exceptions are relations that fail the vertical line test.

## Are ellipses and hyperbolas functions?

Your very question–“Why is an ellipse not a function?” shows it. When read precisely, the obvious way to answer this question is, “Because an ellipse is a kind of curve, and a function is [to use your words] just input and output values.”