Question

Resolva o sistema: *


a) ( 0 ; - 1 )

b) ( - 1 ; 1 )

c) ( - 2 ; 1 )

d) ( 1 ; 1 )

e) ( 1 ; - 1 )

Answer 1

$\left \{ {{5x+3y=2} \atop {4x-2y=6}} \right.$

$\left \{ {{5x+3y=2} \atop {2x-y=3}} \right.$

$\left \{ {{5x+3y=2} \atop {6x-3y=9}} \right.$

$(5x+3y)+(6x-3y)=2+9$

$5x+3y+6x-3y=11$

$11x=11$

$x=1$

$5x+3y=2$

$5\cdot 1+3y=2$

$5+3y=2$

$3y=2-5$

$3y=-3$

$y=-1$

e) (1 ; -1)