Question 253837
You could graph these and use the vertical line test to see which one is not a function.  You could also look to see if any x value has more than one y value.  A function can not have multiple F(x) values for an x.  This means that when x=5, y can not equal 3 and 7.
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If you need any more help, then email me at justin.sheppard.tech@hotmail.com and I will help you.  I do not want to just "give you" the answer though.
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Justin