To explain: whether the vertical line test or mapping diagram is prefer to find the whether the relation is a function or not.
Explanation of Solution
Given information:
The vertical line test and mapping diagram
Vertical line test:
If the vertical lines drawn along the y-axis on to the given graph are intersecting at only one point, then the relation is a function.
Mapping diagram:
In a relation, if the each element of set one is related to exactly only one element of set two. Then the relation is a function.
Hence, vertical line test is better to find whether the function is relation or not.
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