# How do solve the following linear system?:  2x +5y - 21 = 0 , 11x + 3y + 7 = 0 ?

Jul 17, 2017

See the solution

#### Explanation:

By using elimination system

Multiply eqn 1 by 3 and eqn 2 by 5

$\textcolor{w h i t e}{00} 6 x + 15 y = + 63$
$\underline{\textcolor{w h i t e}{0} 55 x + 15 y = - \textcolor{w h i t e}{0} 7} \leftarrow \text{ Subtract}$
$- 49 x + 0 y = \textcolor{w h i t e}{000} 70$

$x = - 1.428$

Now substitute x in any eqn