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serious [3.7K]
4 years ago
10

1. 2x – 3y = -62. 8x + 4y= -56​

Mathematics
2 answers:
Makovka662 [10]4 years ago
7 0

Step-by-step explanation:

2x - 3y= - 6........(1)

8x + 4y = - 56......(2) multiply equation (1) all through by 4

8x - 12y = - 24.....(3)

Subtract eq (3) from (3)

8x + 4y - (8x - 12y) = - 56 - (-24)

8x + 4y - 8x + 12y = - 32

8x cancels out

4y + 12y = - 32

16y = - 32

y =-2

Substitute y = - 2 in eq (1)

2x - 3(-2) = - 6

2X +6 = - 6

2x =-6-6

2x = - 12

x =-6

Therefore, x= - 6, y= - 2.

Natasha2012 [34]4 years ago
3 0

Step-by-step explanation:

[tex]let \\ 2x - 3y = - 6 \: \: \: \: \: eq.1\\ 8x + 4y = - 56 \: \: \: \: \: eq.2 \\ now \: \\ eq.1 \times 4 - eq.2 \\ the \: we \: get \\ - 16y = 32 \\ y = - \frac{16}{8} =-2 \\ and \: \\ x = -6

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9f + 10f -12f

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Ayuda, no le entiendo :)
Dmitry [639]

Trabajando 10 horas por día, en 6 días se producen 3000 ruedas.

<h3>¿Cuántos dias tardarán en fabricar 3000 ruedas si trabajan 10 horas diarias?</h3>

Sabemos que trabajando 8 horas, en 5 dias producen 2000 ruedas.

El número total de horas que trabajan en esos 5 dias es:

(8 horas)*5 = 40 horas

Entonces se producen 2000 ruedas en 40 horas, es decir, la razon de trabajo es:

(2000 ruedas)/(40 horas) = 50 ruedas por hora.

Ahora, sí en la fabrica trabajan 10 horas al día, entonces van a producir:

10h*(50 ruedas por hora) = 500 ruedas por día.

El número x de días que deben trabajar para producir 3000 ruedas es:

x*(500 ruedas por dia) = 3000 ruedas

x = (3000 ruedas)/(500 ruedas por dia) = 6 dias.

Trabajando 10 horas por día, en 6 días se producen 3000 ruedas.

Sí queres aprender más sobre razones de trabajo:

brainly.com/question/8728504

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