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miskamm [114]
3 years ago
6

3x+y=5 , 2x-2y=22 solve the system of equations by the addition method

Mathematics
2 answers:
IgorLugansk [536]3 years ago
5 0

<span><em />
3x+y=5</span>

<span /><span>2x-2y=22 ...............2(x-y)=22 ⇒ x-y=11</span><span><em /></span>

<span><em>3x+y=5</em></span>

<span /><span><em><u>x-y=11                   </u> </em>(+)</span>

<span />3x+x+y-y=11+5

<span>4x=16  /:4</span>

<span /><em>x=4</em>

x-y=11

4-y=11

-y=7 /*(-1)

<em>y=-7</em>


<span><em></em></span>

vitfil [10]3 years ago
4 0
3x+y=5\\&#10;2x-2y=22\\\\&#10;3x+y=5\\&#10;\underline{x-y=11}\\&#10;4x=16\\&#10;x=4\\\\&#10;4-y=11\\&#10;-y=7\\&#10;y=-7\\\\&#10;\boxed{(x,y)=(4,-7)}&#10;
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Alana earnerd money doing chores. Her grandmother agreed to add $4.00 to the amount Alana earned and then give her half of that
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Answer:

Hence amount of Alana's donation is $4.5.

Step-by-step explanation:

Amount of Alana's donation = x

Her grandmother agreed to add $4.00 to the amount Alana earned.

So new amount of money = (x+4)

She gives only half of the sum which is (x+4)/2.

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\frac{\left(x+4\right)}{2}=4.25

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x+4=8.5

x=8.5-4

x=4.5

Hence amount of Alana's donation is $4.5.

6 0
3 years ago
Find two integers whose sum is -5 and product is -36
Maslowich

Answer:

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Step-by-step explanation:

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5 0
2 years ago
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Is -6 greater or lesser than -5
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less than because when it turns negative it reverses how it would normally be. so 6 is greater than 5 but -6 is less than -5


3 0
3 years ago
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A university administrator was interested in determining if there was a difference in the distance students travel to get from c
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Answer:

D. With a p-value of 0.305, we do not have statistically significant evidence that the population mean distance traveled to class is different for men and women.

Step-by-step explanation:

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How we take the decision?

The significance level is the standard of 0.05.

If the p-value is greater than 0.05, there is no evidence that the distances are statistically different for the population.

If the p-value is less than 0.05, there is evidence that the distances are statistically different different for the population..

In this question:

p-value: 0.305 > 0.05, so there is no statistically significant evidence that the means are difference, and the correct answer is given by option d.

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