Question

$\left \{ {{4x - y = 12} \atop {6x + 2y = 14}} \right.$


Me ajudem pvr

Answer 1

{ 4x - y = 12

{ 6x + 2y = 14

y = 12 - 4x

6x + 2y = 14

6x + 2 ( 12 - 4x ) = 14

6x + 24 - 8x = 14

- 2x = - 10 . ( - 1 )

2x = 10

x = 10/2

x = 5

y = 12 - 4x

y = 12 - 4 . ( 5 )

y = 12 - 20

y = - 8

S = {( 5 , - 8 )}