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Pachacha [2.7K]
3 years ago
15

Im getting an answer that i dont know if its correct so pls help me

Mathematics
1 answer:
Dennis_Churaev [7]3 years ago
6 0
\bf \begin{array}{llll}
18x-y=24&\implies &\quad 18x-y=24\\
9x+4y=-15&\boxed{\times -2}\implies &-18x-8y=30\\
&&--------\\
&&\qquad 0-9y=54
\end{array}\\\\
-----------------------------\\\\
-9y=54\implies y=\cfrac{54}{-9}\implies \boxed{y=-6}
\\\\\\
\textit{now, let's use that "y" in the first equation}
\\\\\\
18x-(-6)=24\implies 18x+6=24\implies 18x=18\implies \boxed{x=1}
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Answer:

4 rolls

Step-by-step explanation:

We can use logic to find how many rolls of toilet paper you would need.

If you use 10 sheets of toilet paper every time you use the toilet, and this happens 3 times a day, then each person per day uses 10\cdot 3 = 30 sheets of toilet paper per day.

For a 4 family household with 4 people, that would be 30 \cdot 4 =120 sheets every day for the whole family.

For a week (7 days) the whole family would use 120 \cdot 7 = 840 sheets per week.

If rolls of toilet paper are shipped by every 250 sheets, then we'd need 840 \div 250 = 3.36 rolls.

We can't have 0.36 of a roll, so we round up to 4 so we have enough.

Hope this helped!

4 0
4 years ago
If Mei has earned 30 points, write and solve a multiplication equation to find how many books she need to read.
sweet [91]

Answer:

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Step-by-step explanation:

Let

x------> the number of books

we know that

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3 0
3 years ago
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Olenka [21]

the answer to this question is 15

3 0
3 years ago
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What is the solution to the system of equations?<br> y = 2/3 x + 3<br> X= -2
ludmilkaskok [199]

The solution to the given system of equations is x = -2, y = 5/3. That is (-2, 5/3)

<h3>Solving system of equations </h3>

From the question, we are to determine the solution to the given system of equations

The given system of equation is

y = 2/3 x + 3     ----------- (1)

x= -2                 ----------- (2)

The value of x has been given in the second equation of the system of equations.

Now, we will determine the value of y

From the second equation, we have that

x = -2

Substitute the value of x into the first equation,

y = 2/3 x + 3

y = 2/3 (-2) + 3

y = -4/3  + 3

y = 5/3

Hence, the solution to the given system of equations is x = -2, y = 5/3. That is (-2, 5/3)

Learn more on Solving system of equations here: brainly.com/question/13729904

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4 0
2 years ago
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Elodia [21]

Answer:

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Step-by-step explanation:

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