Question

X+y=6
X-y=8
..................................

Answer 1

x + y = 6
x - y = 8
========
2x = 14
x = 14/2
x = 7

x + y = 6
7 + y = 6
y = 6 - 7
y = -1


S={ 7, -1 }

Answer 2

Boa noite

x + y = 6
x - y = 8

soma
2x = 14
x = 7

7 + y = 6
y = 6 - 7 = -1

S = (7, -1)