Defining and Identifying Functions Quiz for 8th Grade mathematics | Free Online Practice

Question 1

What is a function?

Accepted Answer

A rule that assigns exactly one output to each input.

Question 2

Which of the following sets of ordered pairs represents a function?

Accepted Answer

{(1, 2), (2, 3), (3, 4)}

Question 3

Which equation represents a linear function?

Accepted Answer

y = 2x + 5

Question 4

Identify the graph of the function y = 3x + 1.

Accepted Answer

A straight line.

Question 5

Does the relationship {(1, 2), (1, 3), (2, 4)} represent a function?

Accepted Answer

No, because the input 1 has two different outputs.

Question 6

Which of the following is a non-linear function?

Accepted Answer

y = x^2 - 4

Question 7

What does the 'm' in the equation y = mx + b represent?

Accepted Answer

The slope of the line.

Question 8

How can you tell if a table of values represents a function?

Accepted Answer

Each input must have exactly one output.

Question 9

Given the equation y = -2x + 3, what is the y-intercept?

Accepted Answer

3

Question 10

Which statement is true about the function y = 4x?

Accepted Answer

It is a linear function.

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