How do you determine if (1, 5), (2, 6), (3, 7), (4, 8) is a function?

Related questions

• What is Vertical Line Test?
• What is an example of a graph that fails the vertical line test?
• How do you use the vertical line test?
• When is a relation a function?
• How do you determine if the following sets of points is a function: #{(2,3), (-1, 3), (4, 7), (-1, 5)}#?
• Why does the vertical line test work?
• Does a linear graph pass the vertical line test?
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• Is {(–2, 4), (5, 8), (3, 6), (5, 9)} a function?