Question

Quanto é ×+y=9
×-y=5

Answer 1

x + y = 9

x - y = 5


2x = 14

X = 14/2

X = 7


y = 9 - y

y = 9 - 7

y = 2




S = { 7 , 2 }

Answer 2

{X+Y=9
{X-Y=5

2X=14
X=14/2
X=7