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3 years ago

X and y vary directly and x=6 when y=42, find k. What is y when x=12?

Mathematics

2 answers:

Artyom0805 [142]3 years ago

8 0

Since x and y are directly proportional , so x = ky

6 = 42k
k = 6/42 = 1/7

12= (1/7)y
y = 84

Luda [366]3 years ago

8 0

The answer would be 21 i think.

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