F:r tends to r f(x) = 3x prove that f is one one onto
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A function is onto if and only if for every y in the codomain, there is an x in the domain such that f(x)=y
clearly for every y=3x,there is x/3
if f(a)=f(b)
3a=3b
a=b
so f is 1-1 also
clearly for every y=3x,there is x/3
if f(a)=f(b)
3a=3b
a=b
so f is 1-1 also
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