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Show that the function f: Q->Q defined b...

Show that the function `f: Q->Q` defined by `f(x)=3x+5` is invertible. Also, find `f^(-1)` .

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Suppose, x and y be two elements of the domain (Q), such that

`f(x)=f(y) `

` Rightarrow 3 x+5=3 y+5 `

` Rightarrow 3 x=3 y `

` Rightarrow x=y`

f is one-one.

take y be in the co-domain (Q), such that `f(x)=y`

` ...
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