# class 11 chapter straight line

#### Pair of straight line.

Equation of pair of straight line.                     What does concept of pair of straight line represent.                     Let $L_1\,:\,a_1x+b_1y+c_1=0$ and  $L_2\,:\,a_2x+b_2y+c_2=0$ be two lines, then pair of straight line (also called as combined equation of given lines) […]