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Irina18 [472]
3 years ago
14

If you were to solve the following system by substitution, what would be the best variable to solve for and from what equation?

Mathematics
1 answer:
VashaNatasha [74]3 years ago
7 0

Answer: B. x, in the second equation

Step-by-step explanation:

The given system :

2x+6y=9...................(1)\\\\3x-12y=15.........................(2)

To apply the substitution method , first we need to select the best variable and  a equation which is easy to simplify.

From the given system equation (2) have all the numbers which are multiples of 3.

Then we divide 3 on both sides of equation (2), we get

x-4y=5\\\\\Rightarrow\ x=4y+5

Therefore, the best variable to solve for and from what equation is x, in the second equation.

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The first thing we must do for this case is to define a variable.
 We have then:
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 We then have the following equation:
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each pallet with cement weigh:
 
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3 years ago
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Step-by-step explanation:

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Discuss some ways that the concepts of covariance and correlation are similar or different.
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Answer:

Step-by-step explanation:

<em>Key Differences Between Covariance and Correlation </em>

<em>The following points are noteworthy so far as the difference between covariance and correlation is concerned: </em>

<em> </em>

<em>1. A measure used to indicate the extent to which two random variables change in tandem is known as covariance. A measure used to represent how strongly two random variables are related known as correlation. </em>

<em>2. Covariance is nothing but a measure of correlation. On the contrary, correlation refers to the scaled form of covariance. </em>

<em>3. The value of correlation takes place between -1 and +1. Conversely, the value of covariance lies between -∞ and +∞. </em>

<em>4. Covariance is affected by the change in scale, i.e. if all the value of one variable is multiplied by a constant and all the value of another variable are multiplied, by a similar or different constant, then the covariance is changed. As against this, correlation is not influenced by the change in scale. </em>

<em>5. Correlation is dimensionless, i.e. it is a unit-free measure of the relationship between variables. Unlike covariance, where the value is obtained by the product of the units of the two variables. </em>

You can find more here:  http://keydifferences.com/difference-between-covariance-and-correlation.html#ixzz4qg5YbiGj

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Range = {5, 0, 2}

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========================================

Problem 2

This is a function as well. We do not have any input going to multiple outputs.

Domain = {-2, -3, 5}

Range = {6, 7, 8}

========================================

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This is not a function. The input -4 goes to more than one output (outputs 3 and -1 at the same time)

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