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erastova [34]
2 years ago
8

If there is direct variation and y = 27 when x = 4, find y when x =12.

Mathematics
1 answer:
Aleksandr [31]2 years ago
4 0

Answer:

B

Step-by-step explanation:

Given y and x vary directly then the equation relating them is

y = kx ← k is the constant of variation

To find k use the condition y = 27 when x = 4 , then

27 = 4k ( divide both sides by 4 )

\frac{27}{4} = 6.75 = k

y = 6.75x ← equation of variation

When x = 12 , then

y = 6.75 × 12 = 81

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