Graphs on the coordinate plane can show?

• A. Only one pair of numbers
• B. The area of a triangle
• C. Relationships between quantities
• D. The sum of two unrelated numbers

Answer: (C)

Graphs on the coordinate plane are about showing how two quantities relate to each other. The horizontal axis represents one quantity and the vertical axis represents the other, so every plotted point (x, y) pairs a value on one axis with a value on the other. When you plot many points or draw a line or curve, you can see patterns, trends, and how changing one quantity affects the other. That ability to illustrate relationships is what makes graphs on the coordinate plane so useful. It’s not about a single number, nor specifically about area, and it isn’t about summing two numbers that aren’t related—the graph’s purpose is to visualize the connection between two quantities.