Question

resover por metodo de sustitucion:2x+y-z=11, x-3y=-20, 4x+2y+5z=8​

Answer 1

2x + y - z = 11

4x + 2y + 5z = 8

(obviamos la segunda secuencia de ecuación)

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​10x + 5y - 5z = 5

4x + 2y + 5z = 8

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14x + 7y = 13

x - 3y = -20

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42x + 21y = 39

7x - 21y = -140

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49x = -140

x = - 2.86~

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5.72 + y - z = 11

11.44 + 2y + 5z = 8

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y - z = 5.28

2y + 5z = -3.44

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7y = 22.96

y = 3.28

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5.72 + 3.28 - z = 11

11.44 + 6.56 + 5z = 8

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9 - z = 11

18 + 5z = 8

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z = -2

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COMPROBACIÓN:

5.72 + 3.28 - -2 = 11

11.44 + 6.56 + -10 = 8

:) Amé hacer esto, Dios te bendiga