Resposta :
R: x = 7; y = 3
x + y = 10
x - 3y = -2
x = 10 - y
10 - y - 3y = -2
10 - 4y = -2
-4y = -12 (-1)
4y = 12
y = 3
x + 3 = 10
x = 10 - 3 = 7
R: x = 7; y = 3
x + y = 10
x - 3y = -2
x = 10 - y
10 - y - 3y = -2
10 - 4y = -2
-4y = -12 (-1)
4y = 12
y = 3
x + 3 = 10
x = 10 - 3 = 7