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Show that increasing functions and decreasing functions are​ one-to-one. That​ is, show that for any x1...

Show that increasing functions and decreasing functions are​ one-to-one. That​ is, show that for any x1 and x2 in​ I, x2≠x1 implies ​fx2​)≠​f(x1​).

If x2≠x1​, what can be concluded about x2 and x1​?

A.It must be true that x2<x1 or x2>x1.

B.It must be true that x2>x1.

C.It must be true that x2<x1.

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