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Is there a case a linear equation is not a function?

Can you give an example?

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Ryan S. | Mathematics and StatisticsMathematics and Statistics
4.8 4.8 (10 lesson ratings) (10)
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Any vertical line is not a function; it will not pass the vertical line test. Otherwise any straight line is a function.
 
A vertical line has an equation x = k, where k is a constant.
 
Examples:
 
x=0
x=-3
x=2
x=5/6