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

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Answer 1 · 2017-07-17T18:41:39

See the solution

By using elimination system

Multiply eqn 1 by 3 and eqn 2 by 5

$006 x + 15 y = + 63$ $color(white)(00)6x+15y=+63$
$ul(color(white)(0)55x+15y=-color(white)(0)7)larr" Subtract"$
$-49x+0y=color(white)(000)70$

$x = -1.428$

Now substitute x in any eqn

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