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2 years ago

What is the solution to this system of equations? x + 2 y = 4. 2 x minus 2 y = 5.

Mathematics

2 answers:

Verdich [7]2 years ago

5 0

Answer:

y=1/2

Step-by-step explanation:

Mila [183]2 years ago

3 0

Answer:

(x,y) = (5.8,-0.4)

Step-by-step explanation:

1.) x + 2y = 4.2 - 2y = 5

2.) { x + 2y =5

{ 4.2 - 2y = 5

3.) { x + 2y = 5

{ y = -0.4

4.) x + 2x ( -4.0 ) = 5

5.) x= 5.8 ( a possible solution )

6.) ( x , y ) = ( 5.8 , -0.4 ) check to the solution

7.) 5.8 + 2 x ( -0.4 ) = 4.2 - 2 x ( -0.4 ) = 5

8.) 5 =5 =5

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A Pipe that is 120 cm long resonates to produce sound of wavelengths 480 cm, 160 cm and 96 cm but does not resonate at any wavelengths longer than these. This pipe is:

A. closed at both ends

B. open at one end and closed at one end

C. open at both ends.

D. we cannot tell because we do not know the frequency of the sound.

The right choice is:

B. open at one end and closed at one end .

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Given:

Length of the pipe, $L$ = 120 cm

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We have to find whether the pipe is open,closed or open-closed or none.

Note:

The fundamental wavelength of a pipe which is open at both ends is 2L.
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