Question

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

Answer 1

See the solution

Explanation:

By using elimination system

Multiply eqn 1 by 3 and eqn 2 by 5

`color(white)(00)6x+15y=+63`
`ul(color(white)(0)55x+15y=-color(white)(0)7)larr" Subtract"`
`-49x+0y=color(white)(000)70`

`x = -1.428`

Now substitute x in any eqn