$Find y if fof (y) = 5 and f (y) = 3 y - 1$

-2

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-1

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Solution

The correct option is B 1

Given, $f (y) = 3 y - 1$ and $f o f (y) = 5$

$f (f (y)) = 5$
$f (3 y - 1) = 5$
$3 (3 y - 1) - 1 = 5$
$9 y - 4 = 5$
$9 y = 9$
$y = 1$

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