The Horizontal Line Test (5.1.2)

Question 1

• The horizontal line test: If the graph of a function intersects every horizontal line at most once, then the function has an inverse.

Answer 1

• The horizontal line test: If the graph of a function intersects every horizontal line at most once, then the function has an inverse.

Question 2

• A one-to-one function is a function that satisfies the horizontal line test. For a one-to-one function, every output y-value comes from exactly one input x-value.

Answer 2

• A one-to-one function is a function that satisfies the horizontal line test. For a one-to-one function, every output y-value comes from exactly one input x-value.