: Resolver el sistema de ecuaciones por el método de reducción. -x + 3y = 6 x + y = 2

Answers

Answer 1

Answer:

Answer:

$x=0\ny=2$

Step-by-step explanation:

El método de reducción también llamado Suma y Resta, consiste en multiplicar una o ambas ecuaciones de tal manera que los coeficientes de una de las incógnitas sean iguales y de signo contrario, de tal forma que se eliminen al sumar las ecuaciones.

Nuestras ecuaciones son:

$-x+3y=6\nx+y=2$

En este caso podemos observar que x y -x son iguales y de signo contrario así que no tendremos que multiplicar y podemos sumar ambas ecuaciones.

Al sumarlas tenemos que:

$4y=8\ny=2$

Ahora sustituímos el valor que encontramos de y en la segunda ecuación para poder obtener el valor de x.

$x+y=2\nx+2=2\nx=2-2\nx=0$

Por lo tanto, x = 0 y y = 2

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One leg of an isosceles right triangle measures 5 inches. Rounded to the nearest tenth, what is the approximate length of the hypotenuse?a.) 2.5 inches b.) 5.0 inches c.) 7.1 inches d.) 9.8 inches

Answers

c right there i think

The answer is C. 7.1 inches

What is the 217th digit after the decimal point in the repeating decimal 0.3456? How can i calculate this?

Answers

Well I think you mean $0.(3456)$ , I will try to explain as simple as I can ;p

First I would divide 217 by 4, because we need to find 217th digit in 4 digit repeating decimal:

$217/4=(217)/(4)=54(1)/(4)$

$54(1)/(4)$ it means that 3456 will be reapeted 54 times untill 217th digit, and $(1)/(4)$ means that the 217th digit will be the first of those 4 digits in this decimal, so your answer is:
The 217th number after the decimal point in this repeating decimal will be 3

a vertical pole 5 feet long cast a shadow of 2 feet. if at the same time a nearby tree casts a shadow of 10 feet, how tall is the tree?

Answers

The tree is 25 feet log becuase the shadow of the tree is 5 times bigger than the shadow of the pole so the tree should be 5 times bigger than the vertical pole which is 5 feet long.

What is 10 - 3.587can Someone pls explain this to me and show me the work

Answers

Answer: 6.413

Step-by-step explanation:

What is 10 - 3.587?

This is subtraction of decimals. To subtract decimals, you can follow these steps:

• Write down the numbers given with the bigger number on top of the lower number.

• Add zeros after the decimals so the numbers will both have same length.

• Then subtract.

Therefore, 10 - 3.587 will be:

= 10.000 - 3.587

= 6.413

If item costs $99.99 with 15% off and I get final price. It then asks me what percentage of savings. How do I get the percentage of savings

Answers

ok.. if you got 84.99 as you answer then you would put .15 *99.99 then you would get 14.9985 then round and get 15.00 and then 99.99 - 15.00 ....you will get 84.99...i think

Answer:

$84.99

Step-by-step explanation:

Bob and James are finishing the roof of a house =. Working alone, Bob can shingle the roof in 10 hours. James can shingle the roof in 16 hours. How long will it take them working together to shingle the roof? Round your answer to the nearest hundredth if necessary.A) 13 hours
B) 26.67 hours
C) 6.15 hours
D) 0.04 hours

Answers

Bob can do a tenth of the roof in an hour
James can do a sixteenth in an hour

Bob can do 16/160 of the roof in an hour
James can do 10/160 of the roof in an hour

Together they do 26/160 of the roof in an hour
160/26 = 6.15 (to 2 d.p.)

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