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Identifying Functions using Table

A function y=...

Question

A function $y = f (x) = 3 x - 1$ is given.
$Domain of f (x) : {0, 1, 5, 4}$
Fill the blank.

$x$ $y = f (x)$

$4$ $11$

$0$

$1$ $2$

$5$ $14$

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Solution

We know $y = 3 x - 1$ ,
so by putting the value of $x$ we can get the respective value of $y$ .
Now, putting $x = 0$ , we have $y = 3 (0) - 1 = - 1$
Hence, $- 1$ is the correct answer.

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