- How do you know if it is a function or not?
- Is a circle a function?
- What is the standard form of a circle?
- How do you make a circle function?
- What is the difference between function and not a function?
- Is the relation a function yes or no?
- What is not a function?
- How do you tell if a graph is a function?
- Is a straight line a function?
- What is the domain in a function?
- Why is a circle a circle?
- How do you determine a function?

## How do you know if it is a function or not?

A WAY easier (and faster), way to know if it is a function is to see if there are two of the same x-intercept (which make a vertical line).

If there is, then it is NOT a function..

## Is a circle a function?

A circle is a set of points in the plane. A function is a mapping from one set to another, so they’re completely different kinds of things, and a circle cannot be a function.

## What is the standard form of a circle?

2) The general form : x2 + y2 + Dx + Ey + F = 0, where D, E, F are constants. If the equation of a circle is in the standard form, we can easily identify the center of the circle, (h, k), and the radius, r . Note: The radius, r, is always positive. Example 1: (x-2)2 + (y-3)2 = 4.

## How do you make a circle function?

Graphing a circle anywhere on the coordinate plane is pretty easy when its equation appears in center-radius form. All you do is plot the center of the circle at (h, k), and then count out from the center r units in the four directions (up, down, left, right). Then, connect those four points with a nice, round circle.

## What is the difference between 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 the relation a function yes or no?

ANSWER: Sample answer: You can determine whether each element of the domain is paired with exactly one element of the range. For example, if given a graph, you could use the vertical line test; if a vertical line intersects the graph more than once, then the relation that the graph represents is not a function.

## What is not a function?

A function is a relation in which each input has only one output. In the relation , y is a function of x, because for each input x (1, 2, 3, or 0), there is only one output y. x is not a function of y, because the input y = 3 has multiple outputs: x = 1 and x = 2.

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

Mentor: Look at one of the graphs you have a question about. Then take a vertical line and place it on the graph. If the graph is a function, then no matter where on the graph you place the vertical line, the graph should only cross the vertical line once.

## Is a straight line a function?

A linear function is a function whose graph is a straight line. The line can’t be vertical, since then we wouldn’t have a function, but any other sort of straight line is fine.

## What is the domain in a function?

The domain of a function is the set of all possible inputs for the function. For example, the domain of f(x)=x² is all real numbers, and the domain of g(x)=1/x is all real numbers except for x=0. We can also define special functions whose domains are more limited.

## Why is a circle a circle?

A circle is a shape consisting of all points in a plane that are a given distance from a given point, the centre; equivalently it is the curve traced out by a point that moves in a plane so that its distance from a given point is constant.

## How do you determine a function?

How To: Given a relationship between two quantities, determine whether the relationship is a function.Identify the input values.Identify the output values.If each input value leads to only one output value, classify the relationship as a function.