Class 10 · Chapter 3 · Algebra

Pair of Linear Equations in Two Variables

Two lines, and the one point (or none, or all) where they agree.

Source: NCERT Mathematics, Class 10

1. 3.1Two Lines, Three StoriesAttention · Look at where the two lines cross.8 min
2. 3.2Reading the RatiosAttention · Look at a₁/a₂ and b₁/b₂ first. c₁/c₂ only matters if they match.10 min
3. 3.3Substitution: Pick the Easiest DoorAttention · Look for a variable with coefficient 1. Isolate that one.10 min
4. 3.4Elimination: Look for What CancelsAttention · Look for a variable whose coefficients already match in size.10 min