SOLUTION: Restricting the domain to make a one-to-one function. can someone help me for this please? i really don't know. help me :(

Question 1039933: Restricting the domain to make a one-to-one function.
can someone help me for this please? i really don't know. help me :(
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
This requires that a function pass both the vertical and horizontal line test.
y=x^2 is a function. But it is not 1:1, for y=4 has two possible x values, -2 and 2.
y=x^2 for x>=0 is 1:1. It passes the horizontal line test. It is a function, but the domain has been restricted so that x may only be positive.

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