Question

Which of the following graphs represents a function?

Answer 1

A relation is said to be a function if each $x$ in the domain has a unique image, $y.$


We see that the graph of the relation intersects the $Y$-axis at only one point. So, this graph represents a function.


We see that the graph intersects the (Y\)-axis at two points. So, this graph does not represent a function.


Again, the curve intersects the $Y$-axis at three points. So, this graph does not represent a function.