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Gyaan Maths
CBSE · Class 6-10
Class 8 · Chapter 15

Introduction to Graphs

Cartesian plane; plotting points; line graphs; linear graphs.

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Detailed theory
Two perpendicular number lines: xx-axis (horizontal), yy-axis (vertical). Origin O(0,0)O(0,0). Any point is (x,y)(x,y).
Key concepts & formulas
01
Point (x,y)(x,y): xx is horizontal, yy is vertical.
02
Quadrant I: (+,+)(+,+); II: (−,+)(-,+); III: (−,−)(-,-); IV: (+,−)(+,-).
03
Origin is (0,0)(0,0).
04
A linear equation y=mx+cy=mx+c graphs as a straight line.
05
A line graph shows change over time.
Gyaan Maths — CBSE Class 6-10, built for board-toppers.
v1.1 · Feb 2026