Question

Resolva com escalonamento o sistema
x-y = 6
2x = 8

Answer 1

x-y = 6
x = 6+ y

2x = 8
2(6+y)= 8
12 +2y = 8
2y = 8 - 12
2y = - 4
y = -4/2
y = - 2

x - y = 6
x - (-2) = 6
x + 2 = 6
x = 6/2
x = 3