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sergiy2304 [10]
3 years ago
12

What is the solution to the system of linear equations?

Mathematics
2 answers:
FinnZ [79.3K]3 years ago
3 0
X= 3 and y=7

7(-9x+4y=55)
-4(-11x+7y=82)

63x + 28y = 385
44x - 28y = -328
-------------------------
19x            =57
x=3

63(3) + 28y = 385
189 = 28 = 385
28y = 196
y=7
leonid [27]3 years ago
3 0

we have

-9x+4y=55 -----> equation A

-11x+7y=82 -----> equation B

Using a graphing tool

we know that

the intersection both graphs is the solution of the system of equations

see the attached figure

The solution is the point (-3,7)

therefore

<u>the answer is</u>

x=-3\\y=7

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Write an algebraic expression for: The sum of ten and a number.
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Hi,

The sum of ten and a number.

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So if the question uses AND, it's adding.

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Tienes un triángulo equilátero con lados de 10cm, lo divides en dos partes de manera horizontal tal que el área de ambos figuras
Tanya [424]

Answer:

x = 10/√2 ≈ 7.07

Step-by-step explanation:

Comenzaremos por dividir el triángulo en dos partes y definir H, como en la figura adjunta.

Aplicando el teorema de Tales, sabemos que:

\dfrac{l/2}{H}=\dfrac{x/2}{h}\\\\\\\dfrac{l}{H}=\dfrac{x}{h}

También sabemos que, dado que el tirángulo menor es la mitad que el triángulo mayor, la relación entre áreas es:

\dfrac{A}{A_x}=\dfrac{lH/2}{xh/2}=\dfrac{lH}{xh}=2

Dado que formamos dos triángulos rectángulos, podemos despejar el valor de H como:

(l/2)^2+H^2=l^2\\\\H^2=l^2-(l/2)^2=10^2-5^2=100-25=75\\\\H^2=\sqrt{75}

Podemos entonces despejar x de la siguiente manera:

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4 years ago
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