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VikaD [51]
3 years ago
14

I’m confused on this answer anyone know it?

Mathematics
1 answer:
slamgirl [31]3 years ago
7 0

Answer:

y=\frac{26}{7},\:x=-\frac{15}{7}

Step-by-step explanation:

\begin{bmatrix}4x+5y=10\\ -2x+y=8\end{bmatrix}\\\\\begin{bmatrix}-2\cdot \frac{10-5y}{4}+y=8\end{bmatrix}\\\\

-5+\frac{7y}{2}=8\\\\\mathrm{Multiply\:both\:sides\:by\:}2\\-5\cdot \:2+\frac{7y}{2}\cdot \:2=8\cdot \:2\\-10+7y=16\\y=\frac{26}{7}\\

\mathrm{For\:}x=\frac{10-5y}{4}\\\mathrm{Subsititute\:}y=\frac{26}{7}\\x=\frac{10-5\cdot \frac{26}{7}}{4}\\\\

x=-\frac{15}{7}\\

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Vadim26 [7]

Answer:

B. The graph of g(x) is narrower than the graph of f(x)

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check the image given below.

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6 0
2 years ago
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Find the exact value of sec theta if csc theta = -4/3 and the terminal side of theta lies in quadrant III
GREYUIT [131]

Answer:

-4 sqrt(7)/7

Step-by-step explanation:

csc theta = -4/3

csc theta = hypotenuse / opposite side

hypotenuse = 4  

opposite  = 3

Using the pythagorean theorem

a^2 + b^2 = c^2

3^2 + b^2 = 4^2

9+b^2 = 16

b^2 = 16-9

b^2 = 7

Taking the square root

sqrt(b^2) = sqrt(7)

b = sqrt(7)

We are in the third quadrant so only tan  and cot are positive

that means the x and y values are "negative"  so a = -3 and b = - sqrt(7)

sec theta = hypotenuse / adjacent

                = 4/ - sqrt(7)

rationalizing  

                   -4 sqrt(7)/ sqrt(7)* sqrt(7)

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2 years ago
The table shown below represents a function. Which of the following values could not be used to complete the table?
geniusboy [140]

<u>Answer:</u>

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<u>Step-by-step explanation:</u>

The original graph

<h3>X                Y</h3><h3>-25             -10</h3><h3>-5                 10</h3><h3>5                   15</h3><h3 />

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A local health club has a large swimming pool non member must pay a 6$ per day fee to use the pool member of the club pay 1$ but
vazorg [7]

Answer:

50 days

Step-by-step explanation:

Step one:'

given data

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Step two

equate the two expression to find x

6x=250+x

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