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Sonbull [250]
4 years ago
10

Which of the following equations is an example of inverse variation between the variables x and y

Mathematics
1 answer:
Sonbull [250]4 years ago
5 0

Answer:

The answer is y = 6/x ⇒ answer A

Step-by-step explanation:

* Lets revise what is the meaning of the inverse variation

- It is a mathematical relationship between two variables

- It can be expressed by an equation in which the product of two

 variables is equal to a constant

- If y is in inverse variation with x

∴ y ∝ 1/x

- Change this relation to equation

∴ y = k/x, where k is the constant of the variation

- We can write it by another way

∵ y ∝ 1/x

∴ y = k/x ⇒ by using cross multiplication

∴ yx = k

* Now lets solve the problem

∵ There is an inverse variation between the two variables x and y

∴ y ∝ 1/x

∴ y = k/x

- Look to the answer

# We will chose A because

∵ y = 6/x  ⇒ use the cross multiplication

∴ yx = 6 ⇒ and 6 is a constant

∴ k = 6

* The answer is y = 6/x

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3 years ago
Solve by the substitution method.
allochka39001 [22]

Answer:

x = -5 and y = 8 is the solution for the given equations.

Step-by-step explanation:

We are given the following information in the question:

7x + 2y = -19\\-5x + y = 33

We have to use substitution method to solve the following equations in two variables.

-5x + y = 33\\y = 33 + 5x\\\text{Putting this value of y in the first equation}\\7x + 2y = -19\\7x + 2(33+5x) = -19\\7x + 66+10x = -19\\17x = -85\\\\x = \displaystyle\frac{-85}{17} = -5\\\\y = 33 + 5x = 33 + 5(-5) = 33-25 = 8

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What was 50.00 worth in 1900?
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4 years ago
A 2-column table with 8 rows. The first column is labeled x with entries negative 3, negative 2, negative 1, 0, 1, 2, 3, 4. The
IceJOKER [234]

Answer:

Step-by-step explanation:

So I'm going to  make the table here.

x     f(x)

-3     -2

-2     0

-1     2

0     2

1     0

2     -8

3     -10

4     -20

Without looking at the answers we are going to deduce what intervals could make f(x) positive.  Well, where  is it shown as positive for the numbers given?  well f(-1) and f(0) are positive, both at 2.  then both f(-2) and f(1) are 0, then everything below -2 and above 1 make f(x) negative, so it looks like everything up until -2 is negative, but increasing then at -2 it turns to 0 and keeps increasing  at least until some time after f(-1).  It might even just stay at 2 until it gets to f(0), and then after that it decreases.  Hopefully that makes sense.

Given the description, and if you on't understand I can try to explain more carefully, where does it look like it's positive?  Well, it goes from negative to 0 at -2, then after that it's positive until 1, where it turns to 0 again, before decreasing.    so everything between -2 and 1 look to make f(x) positive.  Since f(-2) and f(1) don't themselves though it means they are not included, so you use parenthesis.

so the answer is (-2,1)  Again, let me know if you need more of an explanation.

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3 years ago
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