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forsale [732]
3 years ago
9

What is the solution to the system of equations? Use the linear combination method. {2x−3y=93x+5y=4 Enter your answer in the box

es. ( , )
Mathematics
1 answer:
Vika [28.1K]3 years ago
4 0

Answer:

(36.692,-6.538) or simplified (36.7,-6.5)

Step-by-step explanation:

2x-3y=93

x+5y=4

You would multiply both sides of the bottom equation by -2

-2(x+5y)=4(-2) > -2x-10y=-8

   2x-3y=93

+  -2x-10y=-8

---------------------

-13y=85

divide both sides by -13

<em>y=-6.538</em>

plug in y for any of the two original equations, I chose the first one

2x-3(-6.5)=93

2x+19.5=93

  -19.5     -19.5

2x=73.5

divide both sides by 2

<em>x=36.692</em>

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Answer:

f ( t ) = 3.7*sin ( 0.01736*t ) + 12

Step-by-step explanation:

Solution:-

- We are to model a sinusoidal function for the number of hours of daylight measured in one year in Ellenville.

- We will express a general form of a sinusoidal function [ f ( t ) ] as follows:

                                f ( t ) = A*sin ( w*t ) + c

Where,

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                  c: The mean hours of daylight

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- The mean hours of daylight ( c ) is the average of the maximum and minimum hours of daylight as follows:

                              c = \frac{f(t_m_a_x ) +f(t_m_i_n )  }{2} \\\\c = \frac{15.7 + 8.3}{2} = \frac{24}{2} \\\\c = 12

- The amplitude ( A ) of the sinusoidal function is given by the difference of either maximum or minimum value of the function from the mean value ( c ):

                              A = f ( t_m_a_x ) - c\\\\A = 15.7 - 12\\\\A = 3.7

- The frequency of occurrence ( w ) is defined by the periodicity of the function. In other words how frequently does two maximum hours of daylight occur or how frequently does two minimum hours of daylight occur.

- The time period ( T ) is the time taken between two successive maximum duration of daylight hours. We were given the longest day occurred on June 21st and the shortest day occurred on December 21st. The number of days between the longest and shortest day will correspond to half of the time period ( 0.5*T ):

                              0.5*T = 7 + 31 + 31 + 30 +31 +30 +21\\\\T = 2* [ 181 ] \\\\T = 362 days

- The angular frequency ( w ) is then defined as:

                              w = \frac{2\pi }{T} = \frac{2\pi }{362}  \\\\w = 0.01736

- We will now express the model for the duration of daylight each day as function of each day:

                              f ( t ) = 3.7*sin ( 0.01736*t ) + 12

               

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At the city museum, child admission is $6.30 and adult admission is $9.60. On Sunday, twice as many adult tickets as child ticke
IRINA_888 [86]

Answer: 20 child tickets were sold that day.

Step-by-step explanation:

Let x represent the number of child tickets that were sold that day.

Let y represent the number of adult tickets that were sold that day.

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3 years ago
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