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kupik [55]
3 years ago
5

90 POINTS IF ANSWER IS RIGHT!!!!!!!!!! PLEASE I NEED HELP!!!!

Mathematics
2 answers:
olganol [36]3 years ago
8 0

Answer:

no solution

Step-by-step explanation:

–5x – 12y – 43z = –136

–4x – 14y – 52z = –146

21x + 72y + 267z = 756

Every coefficient of the second equation is a multiple of 2, so divide both sides by 2.

Every coefficient of the third equation is a multiple of 3, so divide both sides by 3.

–5x – 12y – 43z = –136

–2x – 7y – 26z = –73

 7x + 24y + 89z = 252

Let's call the above system the "simplified original system."

Using the simplified original system, multiply the first equation by -2 and the second equation by 5. Then add them.

          10x + 24y + 86z = 272

(+)      -10x - 35x - 130z = 365

------------------------------------------

                   -11y - 44z = 637

Now we have an equation with only y and z.

Now, using the simplified original system, multiply the second equation by 7 and the third equation by 2. Then add them.

        –14x – 49y – 182z = –511

(+)       14x + 48y + 178z = 504

-------------------------------------------

                     -y - 4z = -7

Now we have a system in 2 unknowns, y and z.

-11y - 44z = 637

-y - 4z = -7

Multiply the second equation by -11 and add to the first equation.

      -11y - 44z = 637

(+)     11y + 44z = 77

-----------------------------

                 0 = 714

Since 0 = 714 is false, this system has no solution.

Shalnov [3]3 years ago
7 0

Answer:

No solution

Step-by-step explanation:

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olga2289 [7]

Answer

s = 11

Step-by-step explanation:

Find the value of S:

57 + s = 68

Substract 57 from both sides of the equation

s = 68 - 57

s = 11

6 0
3 years ago
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What is the length of BC? Round to the nearest tenth.
Kay [80]

Answer:

BC ≈ 14.5 cm

Step-by-step explanation:

Using the sine ratio in the right triangle

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16 × sin65° = BC , then

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3 years ago
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My name is Ann [436]

Answer:

The number is -1/2

Step-by-step explanation:

Let x be the number

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8 0
3 years ago
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Did i do this right?​
Amanda [17]

Answer:

yes

Step-by-step explanation:

3 0
2 years ago
Number one I am really stuck with can you please help me
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Hope this helped!
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