01 · THE FOUR QUADRANTS
Signs in Four Quadrants
The coordinate axes divide the Cartesian plane into 4 equal regions called Quadrants:
QUADRANT SIGNS
Sign Conventions
• Quadrant I (top right): x > 0, y > 0 ⟹ (+, +) e.g. (3, 5)
• Quadrant II (top left): x < 0, y > 0 ⟹ (-, +) e.g. (-2, 4)
• Quadrant III (bottom left): x < 0, y < 0 ⟹ (-, -) e.g. (-3, -5)
• Quadrant IV (bottom right): x > 0, y < 0 ⟹ (+, -) e.g. (4, -2)
02 · POINTS ON AXES
Coordinates of Points on Axes
• Any point lying on the X-axis has y-coordinate 0: (x, 0).
• Any point lying on the Y-axis has x-coordinate 0: (0, y).
• The Origin has coordinates (0, 0).