Question

pfv ajudaaa alguemmm ​

Answer 1

Vamos là.

a)

2x + 3y + z = 4 (I)

x + y + z = 6 (II)

3x - y + 2z = 11 (III)

(I) + (II)

3x + 4y + 2z = 10

(III)

3x - y + 2z = 11

5y = -1

y = -1/5

de (I) vem

2x - 3/5 + z = 20/5

2x + z = 23/5

de (II) vem

x - 1/5 + z = 30/5

x + z = 31/5

2x - x = 23/5 - 31/5

x = -8/5

x + y + z = 6

-8/5 - 1/5 + z = 30/5

z = 39/5

S = (-8/5, -1/5, 39/5

B)

2x + 5y - z = -3   (I)

       2y + 3z = 14 (II)

               6z = 24 (III)

de (III) vem

z = 4

de (I) vem

2x + 5y = 1

de (II) vem

2y = 2

y = 1

2x + 5 = 1

2x = -4

x = -2

S = (-2, 1, 4)