Question

O produto das soluções do sistema é:​

Answer 1

(i)x+y-z=2

(ii)2x-2y+3z= -13

(iii)3x-y+4z= -13

(i)x+y-z=2   *(2)

(ii)2x-2y+3z= -13

(i)2x+2y-2z=4

(ii)2x-2y+3z= -13

4x+z = -9

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(i)x+y-z=2  

(iii)3x-y+4z= -13

4x+3z=-11

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4x+z = -9   *(-1)

4x+3z=-11

-4x - z = 9

4x+3z=-11

2z=-2

z= -1

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4x+3z=-11

4x + 3(-1) = -11

4x + (-3) = -11

4x=-11+3

4x=-8

x = -2

(i)x+y-z=2

-2 + y -(-1) = 2

-2 +y+1=2

y = 2+1

y=3

x * y * z

- 2 * 3 * -1

-6 * - 1

= 6