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frez [133]
3 years ago
14

Please help. I’ll mark you as brainliest if correct!

Mathematics
1 answer:
balu736 [363]3 years ago
3 0

Answer: x= -1, z=2, y= -4

Step-by-step explanation:

System of equations:

-5x - 4y - 3z= 15  +

<u>-10x + 4y + 6z= 6</u>

-15x         + 3z = 21  ------>  3 (-5x + z) = 7.3

-5x + z = 7

now,

-10x + 4y + 6z= 6

2(-5x + z) + 4y + 4z = 6

14 + 4y + 4z = 6

7 + 2y + 2z = 3

2y + 2z= -4

y+z=-2

Now we were using the equation: 20x + 4y + 4z = -28

20x + 4(y+z) = 20x -8= - 28

20 x = -20

x= -1

With this we can find y and z

X=-1

-5x + z = 7

z= 2

y+z=-2

y=-4

Finally we have: x= -1, z=2, y= -4

I hope this can help you.

Thank you

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7 0
3 years ago
Sales in Tiffin ties declined from 420 in last year to 360. What percentage drop is that
drek231 [11]

Answer:

  • 14.29%

Step-by-step explanation:

<h3>Given</h3>
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5 0
3 years ago
Mathematical word describes both 27x and 6x in the expression 27x+6x?
Maslowich

The mathematical word describing  both 27x and 6x in the expression 27x+6x is "<u><em>addition</em></u>"

<h3>How to form mathematical expression from the given description?</h3>

You can represent the unknown amounts by the use of variables. Follow whatever the description is and convert it one by one mathematically. For example if it is asked to increase some item by 4 , then you can add 4 in that item to increase it by 4. If something is for example, doubled, then you can multiply that thing by 2 and so on methods can be used to convert description to mathematical expressions.

For the given case, the terms were 27x and 6x and the expression formed from them is 27x+6x

This means both the terms were added together, as denoted by '+' (called 'plus') sign.

When two terms are written with 'plus' sign in between, then that means they're added to each other and the result will be addition of both of their's values.

Thus, the mathematical word describing  both 27x and 6x in the expression 27x+6x is <u><em>addition</em></u>"

Learn more about addition here:

brainly.com/question/14148883

7 0
2 years ago
3 ft<br> 10 ft<br> Perimeter:<br> Area:
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Step-by-step explanation:

The area = 3 × 10 = 30

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please give me a brainliest answer

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2 years ago
11 feet 8inches + 2 feet 9 inches
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the asnwer is 14 feet 5 inches because you add feet and then inches

8 0
3 years ago
Read 2 more answers
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