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3 years ago

Variable y varies directly with variable x, and y = 18 when x = 4. What is the constant of variation in decimal form?

1 answer:

5 0

To find the constant of variation, you must use the following equation:

y = kx

'k' is the constant of variation.

y = 18
x = 4
k = ?

18 = k(4)
18/4 = k
k = 4.5

Answer: The constant of variation is 4.5

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OverLord2011 [107]

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Exponent Def. (For cubic)

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Factor (-2)^3 out.

$\displaystyle \large{ {( - 2)}^{ - 3} = \frac{1}{( - 2) \times ( - 2) \times ( - 2)}}$

(-2) • (-2) = 4 | Negative × Negative = Positive.

$\displaystyle \large{ {( - 2)}^{ - 3} = \frac{1}{4 \times ( - 2)}}$

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If either denominator or numerator is in negative, it is the best to write in the middle or between numerator and denominators.

Hence,

$\displaystyle \large \boxed{ {( - 2)}^{ - 3} = - \frac{1}{ 8}}$

The answer is - 1 / 8

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