- #1
marble1112
- 2
- 0
Homework Statement
How do you show that a function with two variables f(x,y) is one-to-one and onto?
example f(x,y) = 2x+y
Homework Equations
Do we have to use linear algebra?
To prove that a function f(x,y) is one-to-one, we can use the horizontal line test. If every horizontal line intersects the graph of f(x,y) at most once, then the function is one-to-one.
Yes, a function can be both one-to-one and onto. This means that for every input, there is exactly one output, and every output has at least one corresponding input. This type of function is called a bijective function.
A one-to-one function has a unique output for every input, while a many-to-one function has multiple outputs for at least one input. In other words, a one-to-one function passes the vertical line test, while a many-to-one function does not.
Yes, a function can be one-to-one even if it has multiple variables. The key is that each input combination must have a unique output. This can be verified by using the horizontal line test on the graph of the function.
To prove that a function f(x,y) is not one-to-one, we can use the counterexample method. This means finding two different input combinations that produce the same output. If even one counterexample exists, then the function is not one-to-one.