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natali 33 [55]
3 years ago
5

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

Mathematics
1 answer:
Digiron [165]3 years ago
6 0

Answer:

x=0\\y=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\\x+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\\y=2

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

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

Por lo tanto, x = 0 y y = 2

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Solve the equation<br> 9x² – 29x – 28 = 0<br> Give your answers to 2 decimal places when appropriate
andrew-mc [135]

Answer:

x = 4 or x = 0.78

Step-by-step explanation:

9x² – 29x – 28 = 0

2 roots: x = ((-(-29) ± √(-29)² - 4 x 9 x (-28)) / (2 x 9)

               = (29 ± √841 + 1008) / 18

               = (29 ± 43) /18

x = 72 /18 = 4     or

x = -14 /18 = - 0.78

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2 years ago
21 m<br> 17 m<br> Find the area
Burka [1]

Answer:

357

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Help please<br>Mark as brainliest
34kurt
You need to use this formula:
([a]/[sinA])=([c]/[sinC])-I am going to use 'a' for the x, and 'c' for 16(square root of 3)
Now its just getting 'a' by itself.
([c] times [sinA])/([sinC])=[a]
[c]=16 square root of 3
sinA=sin(60)=(square root of 3)/2
sinC=sin(90)=1

Plug it in to get 24 for a, or x. Do the same to figure out y with the new sides.
The final y is:
8 square root of 3
Final answer is C.
8 0
3 years ago
*the problem is in the pic that is uploaded
Alex787 [66]
Hmm,
ok,
complete square ok
wait wat

he went from
(x-3)²=16 to
x-3=16
?????
he square rooted the left side only
he has to do it to both sides

he should have done
(x-3)²=16
x-3=+/-4
x=3+/-4
x=7 or -1
8 0
3 years ago
Does the following table show a proportional relationship between the variables x and y? x 5/6 25/6 125/6 y 2 10 50
ki77a [65]

Answer: A:Yes

Step-by-step explanation:

This table shows a proportional relationship between the variables x and y.

3 0
2 years ago
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