The graphs that represent functions:
- 3rd graph.
- fourth graph.
- sixth graph.
How to know if a graph represents a function?
When we have a graph and we want to see if it is a function or not, we need to use the vertical line test.
it says that if we can't find a vertical line that intercepts the graph more than once, then we have a function.
For example, for the first line:
x = 0
Intercepts two points, so this is not a function.
With this in mind, the options that are functions are:
3rd graph.
fourth graph.
Last graph.