Question

Which of the following is a one-to-one function?
A. ƒ(x)=4x+1; x<-2
x-5; x≥-2
B. y=x^2
C. y=[[2x]]
D. ƒ(x)= 2;0≤x<2
3;2≤x<4
4;4≤x<6

Answer 1

One to one function means that for every x value there is exactly one y value that corresponds to it.
B is outta the question as for each x not equal to zero, there are 2 values of y that are mapped to.
C is the answer as y = 2x is only one y for every value of x. Graph it and you will see.

:)

Hope this helps. If it does, please choose good answer.
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