state whether the following graph represent a relation or a function
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state whether the following graph represent a relation or a function
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Answer:
Only one of them is a relation, three of them are functions.
Perform a vertical line test. How? For each graph , draw or imagine drawing many vertical lines. Each vertical line should intersect or meet ONLY ONE point, if it meets more than 1, it is not a function but a relation.
Like my example above. Those red dots pointed by the arrows are points that meet the vertical lines (the yellow lines). For each vertical line or for each yellow line, there is ONLY ONE POINT the intersected the graph (the blue line). Therefore, it is a FUNCTION.
I know you can do it by yourself. :)