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USPshnik [31]
3 years ago
15

please help me and explain. what is the value of

title=" \frac{x}{y} " alt=" \frac{x}{y} " align="absmiddle" class="latex-formula"> if \frac{28}{ x^{2} } =  \frac{7}{xy}
Mathematics
1 answer:
rosijanka [135]3 years ago
8 0
\frac{28}{x^2} = \frac{7}{xy}
multiplying both sides by x^2
28=\frac{7x^2}{xy}
simplifying
28= \frac{7x}{y}
dividing by 7
\frac{28}{7}= \frac{x}{y}
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Use completing the square to solve the equation x2 - 10x = -8.
Kay [80]

Answer:

x^2 - 10x + 25 = 17

Step-by-step explanation:

Please use " ^ " to denote exponentation:

x^2 - 10x = -8

x^2 - 10x + 25 = 17

x^2 - 10x + 25 = -8

x^2 - 10x - 25 = -33

Begin with x^2 - 10x = -8.  Here's the process for completing the square:

1.  Take half of the coefficient of x and square the result:

    (1/2)(-10) = -5, and then (-5)^2 = + 25

2.  Add this 25 to the first two terms of x^2 - 10x = -8 and also to the      constant -8:    x^2 - 10x + 25 = -8 + 25, or     x^2 - 10x + 25 = 17

3.  Match this result to one of the given possible answers.  Turns out that the given possible answer matching our result is the first one:

x^2 - 10x + 25 = 17

     

7 0
3 years ago
Zina solves a system of linear equations by elimination and finds a solution of (2, 2). One of the equations is a + b = 4. What
Dima020 [189]

Answer:

Option D

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6 0
3 years ago
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6) (after 2.3) Consider the infinite system of linear equations in two variables given by ax + by = 0 where (a, b) moves along t
Paraphin [41]

Answer:

Step-by-step explanation:

Given infinite system of linear equations is ax + by = 0

when (a,b) moves along unit circle in plane.

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Since two of equation in thus system will be

1.x+0.y=0\\x=0

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It is clear that x = 0, y= 0 is the only solution

b) Linear independent solution in this system gives some set of solutions

1.x+0.y=0\\\x=0

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0.x+1.y=0\\y=0

Vector form is

\left[\begin{array}{ccc}1&0\\0&1\end{array}\right] =I

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Because [0,0] satisfies that equation

d) If one of the equation is ax + by = 0.00001

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so, the system will be inconsistent

Therefore, the system will have no solution.

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3 years ago
Who can solve this question!!?!?
Tpy6a [65]

Answer: i cant see the picture can you send it to me please

Step-by-step explanation:

7 0
3 years ago
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zimovet [89]
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