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is there any other method of finding onto into functions other than making graphs

is there any other method of finding onto into functions other than making graphs

Grade:12

1 Answers

Arun
25750 Points
5 years ago

A function is said to be onto if there exist an x for every y.

Hence to prove a function to be onto just solve the function for an x

Eg: f(x) = 3x + 5

Let f(x) = y = 3x + 5

x(y-5)/3

Hence there exist a x for every y

And hence the function is onto

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