Math Question (please help)

[Boomwebsearch]

Which one of these numbers is not like the others, and explain why that number is not like the others in the set (view attachment to see the number set that I am referring to) ?   I am asking this off-topic question to see if anyone knows the answer and can help me by letting me know. I am trying to review some mathematics concepts that I learned a long time ago. For mods and administrators: I have not been creating duplicate posts about a Math question, as you will see all of the questions that I have posted slightly vitiating (different problems on the same concept). 

[79wjd]

5 and 3 

 

For future reference, 

x+y=8 -> x=8-y

x*y=15 -> (8-y)y=15 ->8y-y^2-15=0 -> y=3,5

In this case it happens to work out that y has two solutions which are both correct, but it won't always work out that way, so then take both y's and see what x would be for each y.

[Boomwebsearch]

Just now, djdwosk97 said:

5 and 3

Thank you for constructing a comment/post in order to help me resolve my question/problem. I appreciate your help highly.