2x + 6y + z = 7 X + 2y - z = - 1 5x + 7y - 4z = 9 ayudenme a resolver esta ecuacion 3por 3?

2x + 6y + z = 7

x + 2y - z = - 1

5x + 7y - 4z = 9

z = 7 - 2x - 6y z = 7 - 2(3 / 8) - 6(13 / 24) z = 3

x + 2y - (7 - 2x - 6y) = - 1

x + 2y - 7 + 2x + 6y = - 1

3x + 9y = 6

x + 3y = 2

x = 2 - 3y x = 2 - 3(13 / 24) = 3 / 8 x = 3 / 8

5(2 - 3y) + 7y - 4(7 - 2(2 - 2y) - 6) = 9

10 - 15y + 7y - 4(7 - 4 + 4y - 6) = 9

10 - 8y - 28 + 16 - 16y + 24 = 9

22 - 24y = 9

13 = 24y

y = 13 / 24.