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The value of y varies directly with x. When x = 2, y = 48. What is the value of x when y is 6?

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Answer:

x = 1/4

Explanation:

There are a couple of ways you can think about this.

1) Realize that y=6 is a factor of 8 smaller than y=48. Then the corresponding x-value will be a factor of 8 smaller than 2. When y=6, the value of x is 2/8 = 1/4.

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2) "Varies directly" means that x and y have the relation ...

y = kx

When y=48 and x=2, this is ...

48 = k·2

24 = k . . . . . divide by 2 to find k

Now that we know k=24, we can find x for y = 6:

6 = 24x

6/24 = x = 1/4

The value of x is 1/4 when y = 6.

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