Question

Qual o valor de X, Y e Z?

X - 4Y - Z = 5
2X + 7Y - 2Z = 16
X + Y + Z = 7

Answer 1

Resposta:

x-4y-z=5 x(-2)

2x+7y-2z=16

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-2x+8y+2z=-10

2x+7y-2z=16

15y=6

y=6/15=2/5

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2x+7y-2z=16

x+y+z=7 x(-2)

2x+7y-2z=16

-2x-2y-2z=-14

5y-4z=2

5*2/5-4z=2

2-4z=2

-4z=2-2

-4z=0

z=0/-4=0

x-4*2/5-0=5

x-8/5=5

5x-8=25

5x=25+8

x=33/5

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Explicação passo-a-passo: