## What is an example of a non function equation?

The equations y=±√x and x2+y2=9 are examples of non-functions because there is at least one x-value with two or more y-values.

## What is function notation?

Function notation is a way to write functions that is easy to read and understand. Functions have dependent and independent variables, and when we use function notation the independent variable is commonly x, and the dependent variable is F(x). X is the independent variable.

**How do you rewrite an equation in function form?**

An equation is in function form when it is solved for y. (This form will be helpful when graphing a linear equation.) For example, 2 8 x y + = is not in function form. However, we can quickly rewrite it in function form by subtracting 2x from both sides of the equation: 2 8 y x = − + is function form.

### What are some examples of function notation?

Consider a linear function y = 3x + 7. To write such function in function notation, we simply replace the variable y with the phrase f(x) to get; f(x) = 3x + 7. This function f(x) = 3x + 7 is read as the value of f at x or as f of x.

### What is rewrite in function form?

An equation is in function form when it is solved for y. For example, 2 8 x y + = is not in function form. However, we can quickly rewrite it in function form by subtracting 2x from both sides of the equation: 2 8 y x = − + is function form.

**How to rewrite an equation as a function?**

Add 2 2 to both sides of the equation. To rewrite as a function of , write the equation so that x x is by itself on one side of the equal sign and an expression involving only is on the other side.

#### How to write a function in function notation?

Use function notation to represent a function whose input is the name of a month and output is the number of days in that month. The number of days in a month is a function of the name of the month, so if we name the function f f, we write days = f ( month) days = f ( month) or d = f ( m) d = f ( m).

#### What does the notation f ( A + B ) mean?

For example f (a+b) f ( a + b) means “first add a and b, and the result is the input for the function f .” The operations must be performed in this order to obtain the correct result. The notation y= f (x) y = f ( x) defines a function named f f. This is read as “ y y is a function of x x .”

**What does the letter Y represent in function notation?**

The letter x x represents the input value, or independent variable. The letter y y or f (x) f ( x), represents the output value, or dependent variable. Use function notation to represent a function whose input is the name of a month and output is the number of days in that month.