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# What is the vertical and horizontal line tests for 1-1 function?

A graph of a 1-1 function needs to pass both the and the horizontal line test.

A graph will represent a function, if any vertical line drawn crosses it only once. If the function is also 1-1, then any horizontal line drawn will cross it only once. If the horizontal line crosses the graph more than once, the function is not 1-1.