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Nikitich [7]
3 years ago
11

Pweeb help for brainliest

Mathematics
2 answers:
stellarik [79]3 years ago
5 0

Answer:

The correct answer is B

Step-by-step explanation:

2(x-1) + 5x = x-8

Firstly, break all the brackets and you would got:

2x - 2 + 5x = x - 8

Put x into 1 side,

2x + 5x - x = -8 + 2

6x = -6

Divide both side by 6,

6x / 6 = -6/6

x = -1

The correct answer is B

Hope this help you :3

devlian [24]3 years ago
4 0

Answer:

The answer is -1 (B)

Step-by-step explanation:

Given the equation 2(x-1) + 5x = x-8.

To solve the equation for x;

Step 1: open up the bracket in the equation to have;

2x-2+5x = x-8

Step 2: bring all the terms on the right hand side to the left to have;

2x-2+5x-x+8 = 0

Step3: collect the like terms to have;

2x+5x-x-2+8 = 0

6x+6 =0

Step 4: subtract 6 from both sides to have;

6x+6-6 = 0-6

6x = -6

Step 5: divide both sides by the coefficient of x which is 6 to get x.

6x/6 = -6/6

x = -1

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Resolviendo el sistema de ecuaciones veremos que:

  • niña = 23kg
  • niño = 28kg
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<h3>¿Como resolver el sistema de ecuaciones?</h3>

Aqui tenemos el sistema de ecuaciones:

Niña + niño = 51kg

Niño + perro = 46 kg

Niña + perro = 41kg

Para resolver esto, lo primero que debemos hacer es aislar una variable en una de las ecuaciones, por ejemplo, podriamos aislar "perro" en la tercera:

perro = 41kg - niña

Ahora reemplazamos eso en la segunda para obtener:

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niño - niña = 46kg - 41kg = 5kg

niño = niña + 5kg

Ahora logramos obtener la variable "niño" en terminos de la variable "niña". Podemos reemplazar esto en la primera ecuacion del sistema.

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Ahora que sabemos esto, usamos las otras ecuaciones para encontrar el peso del niño y el perro:

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Sí quieres aprender más sobre sistemas de ecuaciones, puedes leer:

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