How Steep Is the Hill?: Author's Purpose

Why did the author most likely write this passage?

• A.To teach readers about slope and how steep a line is
• B.To advertise a product for sale
• C.To entertain readers with a ghost story

Authors use examples to explain their ideas. Which sentence from the passage gives an example?

• A.Slope can be positive, negative, or zero.
• B.For example, if you walk up a hill that rises 4 meters for every 2 meters…
• C.A positive slope means the line goes up from left to right, while a negative slope…