Question

Resolva os sistemas abaixo
A) 2.x + y=10
X-y=2

B) 2.x {+y=10
2.x {+ 2y=2

C) x+y {=15
2.x+{3y= -3

Answer 1

A) $2x+y=10\\ x-y=2~~~~~~~ .(+)\\--------- \\ 3x=12 \\ x=4 \\ y=2$

B) $2x+y=10 \\ x+y=1~~~~~~~ .(-)\\--------- \\ x=9 \\ y=-8$

C) $2x+3y=-3 \\ x+y=15 ~~~~~~~.(-2) \\ --------- \\ y=-33 \\ x=48$

Espero ter ajudado.