Andy C. answered • 11/03/18

Math/Physics Tutor

Injective means one-to-one: that is Every element in the domain is mapped to ONE and

only one element in the range AND VICE VERSA;

You can use the horizontal line test

y=x and y=x^3 are one to one

Surjective means ONTO: that is ALL of the domain is used

Amerov 3.

And because for every elements of the set Y^3 there is an element in the set X it is surjective like : ={(8,2),(-8,-2),(27,3)...} and because there is one element of set Y^3 mapped to an element of the set X it is Injective too. Am I right?11/04/18