Which of the following is true for identity function?

It is a straight line parallel to

x -

axis

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It is a straight line parallel to

y -

axis

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It is a straight line passing through origin

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It is not a straight line

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Solution

The correct option is C It is a straight line passing through origin
Identity function is $f (x) = x$
Its graph is

It is a straight line passing through origin.

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