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asambeis [7]
3 years ago
13

12. If 3x + 4y = -1 and x - 2y = 3, then y=

Mathematics
1 answer:
Hatshy [7]3 years ago
6 0

y=3 and x= 5

Step-by-step explanation:

  • 3×+×=-1 and 4y-2y=3
  • 4×=1 and 2y=3
  • ×=4-1 and y=3+2
  • x=3 and y=5
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Is it true that when we multiply a number by 3, we get the same value as if we added 6 to that number.
seraphim [82]

Answer:

True

Step-by-step explanation:

Multiplying a number by 3 will produce the same value as adding 6 to that number can be expressed algebraically as:

3x = x + 6

In order to determine whether the given statement is true, we can solve for x:

Start by subtracting x from both sides:

3x - x = x - x + 6

2x = 6

Divide both sides by 2:

2x/2 = 6/2

x = 3

Substitute the value of x into the original equality statement:

3x = x + 6

3(3) = 3 + 6

9 = 9 (True statement).

Therefore, it is true that when we multiply a number by 3, we get the same value as if we added 6 to that number.

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3 years ago
Hayden is a manager at a landscaping company. He has two workers to landscape an entire park, Cody and Kaitlyn. Cody can complet
miskamm [114]
Answer:

- equation:
1/t = 1/8 + 1/6
- time: 3.43 hours


Explanation:

1) Working speed of Cody: 1 project / 8 hours

2) Working speed of Kaitlyn: 1 project / 6 hours

3) Joint working speed = working speed of Cody + working speed of Kaitlyn

⇒ 1 project / t = 1 project / 8 hours + 1 project / 6 hours

1 / t = 1 / 8 + 1 / 6

That is the equation to solve.

4) Solution of the equation.

1/t = [3 + 4] / 24

1/t = 7/24

⇒ t = 24/7 ≈ 3.43 hours

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The factors of 22 are 2 and 11
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3 years ago
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Sever21 [200]

Answer:

the third is correct

Step-by-step explanation:

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