Question

If x varies directly as 3y and x= 8 when y=3, find x when y=27

Answer 1

$x \alpha (3y) \\ x = k(3y) \\ x = 8 \: then \: y = 3 \\ 8 = 9k \\ k = (8 \div 9) \\ x = {?} y = 27 \\ x = (8 \div 9)(27) \\ x = 24$
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Answer 2

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