Linear Equations in Two Variables

Linear Equations in Two Variables

1. Form of equation ax+by+c=0

   • Examples in Daily life : Two unknowns-Cost and no. of items.

2. Framing linear equations

   • Consider unknown things as variables.
   • Use unknown absolute figures as constant.
   • Two different scenarios needed to make the two equations.

3. Pair of linear equations in two variables.

   • a1 + b1 is not 0 & a2 + b2 is not 0
   • Also a1/b1 is not equal to a2/b2.

4. Solving for linear equations

   • Draw solutions on graph papers.
     • Check for points of intersections.
   • Algebraic methods of solving linear equations.
     • Cross multiplications
     • Substitution
     • Elimination