Question

Which statements are true of functions? Check all that apply.

Answer 1

Answer:

The correct statements that are true to functions are :

• All functions have a dependent variable.

• All functions have an independent variable.

These above two can be explained as : We write a function as y = f(x), where x is the independent variable, and y is dependent as it depends on x values.

• A horizontal line is an example of a functional relationship.

Rest all options are incorrect.

Answer 2

Answer:

The correct options are:

Option A: All functions have a dependent variable.

Option B: All functions have an independent variable.

Option E: A horizontal line is an example of a functional relationship.

Step-by-step explanation:

Consider the provided information.

Function: A function is a relationship where each input has only one output.

Which is denoted by "y=f(x)" where x is input value, also the variable x is independent and y is dependent.

Each input value has exactly one output value vice versa is not true.

Vertical line test: A equation is said to be a function if all vertical lines intersect the graph at most once.

Now consider the provided options:

Option A: All functions have a dependent variable.

This option is true, by the above definition of function.

Option B: All functions have an independent variable.

This option is true, by the above definition of function.

Option C: The range of a function includes its domain.

This option is false.

Understand this with the help of an example:

Consider the function $y=x^2$

The range of the function is [0,∞) and domain of the function (-∞,∞).

Here range doesn't contains the domain.

Thus this option is wrong.  

Option D: vertical line is an example of a functional relationship.

The equation of the vertical line is x=a where a can be any real number.  

We have different values of y for a unique x also the function fails the vertical line test.

Thus the option D is False.

Option E: A horizontal line is an example of a functional relationship.

The equation of horizontal line is y=a where a can be any real number.

For each input has only one output also it satisfy the vertical line test. We will have same value of y for any x.  Which satisfy the property of function.

Thus this option is true.

Option F: Each output value of a function can correspond to only one input value by definition of function.

Understand this with the help of an example:

Consider the function y=a

The function has same output value for each input value. Which is the contradictory to the option's statement.

Thus, this option is false.

The correct options are:

Option A: All functions have a dependent variable.

Option B: All functions have an independent variable.

Option E: A horizontal line is an example of a functional relationship.