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Nady [450]
3 years ago
8

If 3x + 7y = 12 and x-y= 1, then what is the value of 5x + 5y?

Mathematics
1 answer:
lilavasa [31]3 years ago
8 0

Answer:

14.

Step-by-step explanation:

3x + 7y = 12

x - y = 1           Multiply this by -3:

-3x + 3y = -3     Add this to equation 1:

0 + 10y = 9

so y = 9/10 = 0.9.

x - 0.9 = 1

x = 1.9.

So 5x + 5y = 5*1.9 + 5*0.9

= 14.

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(-4,-2) and (4,0)<br> Point slope form
erma4kov [3.2K]

Answer:

-2

Step-by-step explanation:

I hope it helped you

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8 0
2 years ago
Para hacer 600 m de una obra, 30 obreros han trabajado 12 dias a razon de 10 horas diarias. ¿Cuantos dias necesitaran 36 obreros
Gwar [14]

Respuesta:

25 días

Explicación paso a paso:

Dado :

escenario 1

Área = 600 m

Número de días = 12

Número de trabajadores = 30

Tasa = 6

Escenario 2:

Área = 900 m

Número de días = n

Número de trabajadores = 36

Tasa = 6

Igualar los parámetros en cada escenario:

12 / n = 36/30 * 6/10 * 600/900

12 / n = 6/5 * 3/5 * 2/3

12 / n = 6/5 * 1/5 * 2/1

12 / n = 12/25

12 * 25 = 12n

300 = 12n

n = 300/12

n = 25 días

7 0
2 years ago
Solve For 1/4 + 1/2 + x = - 3/4
ivann1987 [24]

Answer:

x= negitive 6/8

Step-by-step explanation:

Ok think about it 1/4 plus 1/2 is 3/4

so how do i go to negitives?

you double the amount of it and then minus it

because 3/4- 3/4 would be zero

so you have to double it to get that answer

have a wonderful day filled with only joy!

5 0
2 years ago
I need helpppppppppppp
____ [38]

Answer:

The first one is 36 i think and the second is 28 i think

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Help me ASAP for this question
ludmilkaskok [199]

Answer:

Your answer is 7

Hope this helps!

Step-by-step explanation:

You plug 14 in for x then just do 14-7 and you will get 7

7 0
2 years ago
Read 2 more answers
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