Horizontal Line Test
(Press the Graph to move the red lines) Horizontal Line Test If a horizontal line intersects a curve more than once, the inverse is not a function. (Press the Graph to move the red lines) Use the horizontal line test to decide which graphs have an inverse that is a function.
(Press the Graph to move the red lines) Horizontal Line Test If a horizontal line intersects a curve more than once, the inverse is not a function. (Press the Graph to move the red lines) Use the horizontal line test to decide which graphs have an inverse that is a function.