Question

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Answer 1

1. Plot the points on graph paper
2. Perform vertical line test
3. If it passes vertical line test, then it is a function, if not, then not a function
4. If you don't have graph paper, go find some.
5. If you don't know how to plot points on a graph, you should probably look for a personal tutor.

Answer 2

I gave you the steps to solve this. What's the problem?

Answer 3

Yup, precisely.