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Maslowich
2 years ago
12

How many minutes is 7/8 of an hour

Mathematics
2 answers:
Ivenika [448]2 years ago
7 0
It would be 52.5 minutes.
aliina [53]2 years ago
6 0
52 minutes 30 seconds Take 60 minutes divide it by 8 to figure out what 1/8 of an hour is. Then multiply our answer by 7 to find out how many minutes are in 7/8 of an hour.
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Does anyone know how to do this?
kolezko [41]

Answer:

  • x = 1
  • y = -7

Step-by-step explanation:

The coefficients of x and y do not have any "nice" relations, so doing this by elimination is just "brute force" with no particular subtlety.

After multiplying by appropriate numbers, you want the coefficient of one of the variables in one equation to be the opposite of the coefficient of the same variable in the other equation. Here, we can get that by multiplying the first equation by 7 and the second equation by 2.

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Adding these equations with opposite x-coefficients eliminates the x-terms. (That is how the "elimination" method gets its name.)

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Substituting this value into the first equation gives ...

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The solution is x = 1, y = -7.

_____

<em>Additional comment</em>

The multipliers used in this process are essentially the coefficients of one of the variables, with one of them negated. Here, we chose the x-coefficients, because negating one of them gives two positive multipliers. We judge it easier to do the arithmetic using positive numbers.

Had we chosen to use the y-coefficients (3 and 2) for our multipliers, we would probably multiply the first equation by 2, and the second equation by -3. That way, the remaining x-coefficient would be positive.

Planning ahead is helpful, but not essential. It can help to avoid errors and make the work easier to do.

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gizmo_the_mogwai [7]

Answer: B

Step-by-step explanation:  B, because lines A and C would more likely connect to B

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