By using the vertical line test, we conclude that graphs 4 and 5 don't represent functions.
Which of the shown graphs are not functions?
The criteria to know when a graph represents or not a function, is to draw a vertical line and see if the line intersects the graph in more than one point. (This is called the vertical line test).
If you do that with graphs 4 and 5, you will see that these two do not represent functions.
For the other graphs is immediate to know that:
- graph 1: represents a linear function.
- graph 2: represents a constant linear function.
- graph 3: represents a quadratic function.
- graph 6: represents a piecewise function.
If you want to learn more about functions:
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