Question

Can someone, using a graph, demonstrate a function which is one-one but not onto?​

Answer 1

Answer:

this can be shown using the horizontal line test: a horizontal line, drawn anywhere on the graph (i.e. of any y -value), will not intersect with a one-to-one function more than once (if at all). the graph of ex is not surjective. not every y -value is mapped on the graph; ex can never be 0 or below.