1) Resolva os sistemas, u=Q×Q:
A) {x-y=5
{x+y=7

B) {x+y=7
{x-y=1

C) {x-y=2
{2x+y=4

D) {x+y=11
{x-y=3

E) {x-y=1
{x+y=9

F) {2x-3x= -16
{5x+3x=2

G) {x-y=16
{x+y=74

H) {3x+y=0
{11x-y=42

I) {2x-4=20
{2x+y=48

J) {x-2y=7
{6x+2y=70


alguém pode me ajudar por favor!!!!!!!!!!!
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