A function has an inverse if and only if it is one-to-one (injective). The horizontal line test determines this graphically: if any horizontal line intersects the graph at more than one point, the function is not one-to-one and therefore doesn't have an inverse function.

Break down complex topics into smaller, manageable chunks for easier recall.

Zambia

• Joseph Soko – 101 pts

• Distance of A Straight Line
• Mid-point of A Line
• Equation of a Straight Line
• Parallel and Perpendicular Lines
• COMMUNICATION SYSTEMS