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2 years ago

If y varies directly as x and y = -18 and x = 3, find x when y = 30.

Mathematics

2 answers:

Eddi Din [679]2 years ago

6 0

Answer:

x = - 5

Step-by-step explanation:

Given y varies directly as x then the equation relating them is

y = kx ← k is the constant of variation

To find k use the condition y = - 18 when x = 3 , then

- 18 = 3k ( divide both sides by 3 )

- 6 = k

y = -6x ← equation of variation

When y = 30 , then

30 = - 6x ( divide both sides by - 6 )

- 5 = x

Otrada [13]2 years ago

3 0

Answer:

$y \: varies \: directly \: as \: x \: mean \\ \: y \: increase \: or \: decrease \: with \: x \\ y = - 18 \: \: \: \: x = 3 \\ y = 30 \: \: \: x = ? \\ - 18 ? = 90 \\ ? = - 5 = x$

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3 years ago

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Answer:

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Step-by-step explanation:

Given:

Felicity's dog eats no more than two cups of dog food per day.

Felicity's dog eats at least one-quarter cup more than one-half of the amount Martin's dog eats.

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Therefore,

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3 years ago

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andreyandreev [35.5K]

Answer:

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Step-by-step explanation:

A conditional statement is something like:

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This means that if a given proposition P is true, then another proposition Q is also true.

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A biconditional statement is:

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So, using the previous propositions we get:

Its raining if and only if there are clouds in the sky.

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