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By doing a vertical line test. If you can draw a vertical line and it only passes through the graph once, its a function. If it passes through twice, it is NOT a function.
the line that crosses through the origin
If the function is a straight line equation that passes through the graph once, then that's a function, anything on a graph is a relation!
If a vertical line passes through the supposed function at only one spot then you have a function.
The vertical line test! Imagine a vertical line going through all points of the graph. As long as the vertical line only touches the graphed line once, it's a function. If it touches more than once, it is not.