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pogonyaev
3 years ago
14

Solve the system of linear equations by elimination. −2x−5y=9 3x+11y=4

Mathematics
1 answer:
goldenfox [79]3 years ago
3 0

Answer:

x=-17, y=5. (-17, 5).

Step-by-step explanation:

-2x-5y=9

3x+11y=4

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

3(-2x-5y)=3(9)

2(3x+11y)=2(4)

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

-6x-15y=27

6x+22y=8

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

7y=35

y=35/7

y=5

3x+11(5)=4

3x+55=4

3x=4-55

3x=-51

x=-51/3

x=-17

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When 3 is subtracted from one third of a number less than 6. Which inequality and solution represents this sitution?
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Answer:

1/3(n) - 3 < 6; n < 27

Step-by-step explanation:

" 3 subtracted from one third of a number"

= 1/3(n) - 3

given that this is less than 6:

1/3(n) - 3 < 6

1/3(n) < 6 +3

1/3(n) < 9

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3 years ago
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A wheel spins at 300 revolutions per minute. What is the angular velocity of the wheel, in radians per second? Round the answer
Mandarinka [93]
Angular velocity = 300 revolutions per minute

1 revolution = 2π radians.

So, we can write:

Angular velocity = 300 x 2π radians per minute = 600π radians per minute

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Angular velocity = 600π radians per 60 seconds
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3 years ago
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Simplify the radical 7√7-2√28
Umnica [9.8K]

ANSWER

3 \sqrt{7}

EXPLANATION

The given radical is

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Remove the perfect square from the second radical.

= 7 \sqrt{7}  - 2 \sqrt{4 \times 7}

= 7 \sqrt{7}  - 2 \sqrt{4}  \times  \sqrt{7}

= 7 \sqrt{7}  - 2  \times 2 \times  \sqrt{7}

= 7 \sqrt{7}  - 4 \sqrt{7}

Subtract the like radicals

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Answer:

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Step-by-step explanation:

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Answer:

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