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otez555 [7]
2 years ago
7

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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