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Sveta_85 [38]
4 years ago
6

The value of y varies directly with x. If x = 15, then y = 12. What is the value of y, when x = 21?

Mathematics
1 answer:
kobusy [5.1K]4 years ago
4 0

Answer:

y = 16.8

Step-by-step explanation:

Given that y varies directly with x then the equation relating them is

y = kx ← k is the constant of variation

To find k use the condition x = 15 when y = 12, that is

12 = 15k ( divide both sides by 15 )

\frac{12}{15} = k, so

k = 0.8 y = 0.8x ← equation of variation

When x = 21, then

y = 0.8 × 21 = 16.8

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