what is a function

Question

Give the definition and explaination of a function.

Answer 1

y=f(x) in a table of values for a function an x-value can't go to two different y-values.

No points on the graph can be "on top of " each other. This is sometimes called the vertical line test. If you can draw vertical line through two different points, then it is not a function. A circle is not a function. A C-shaped parabola is not a function.

Answer 2

Answer 3

are any of these a function: ~, <, V, D, /, <, s,W,U,>,/, O, M, B 

Thank you for your help.ME