Question

me ajude a responder este sistema x+y=12 x-y=2

Answer 1

x + y = 12
x - y = 2
x = 2 + y

x + y = 12
2 + y + y = 12
2 + 2y =12
2y = 12 - 2
2y = 10
y = 10 / 2 = 5

x = 2 + y
x = 2 + 5
x = 7