An example of not a function on a graph is y² = 4x
A function is a relation between domain and range such that each value in the domain corresponds to only one value in the range.
To check a function is a function we run a vertical line test where the given function is a function if the vertical line crosses given function is not a function.
Lets take an example ;
y² = 4x is a equation
Firstly, we will plot the equation on the graph.
Now , Drawing a vertical line x= 4 parallel to y-axis
If you see , this vertical line is crossing the function twice at (4,4) and (4,-4)
Therefore , y² = 4x is not a function
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