Question

ajuda o amigo aqui por favor

Answer 1

x + y = 2 ===> y = 2 - x

2x - y = 4 ====> 2x - 2 + x = 4 === > x = 6/3 = 2

y = 2- 2 = 0

b)

x/2 = 4 ==> x=8

5 + y = 4 ===> y = -1

c)

x + y = 4 ==> x = 4 - y

x - y = 8 ===> 4 -y -y = 8 ===> y = -2

x = 4 -(-2) = 6