HI! I need help identifying linear/non-linear function.. Can you help me?

I'm an honors student (I don't understand how or why lol) but I don't really a unit that specifies in linear and non-linear function. I need help on how to identify if some equations or graphs are linear or non-linear. It would be great if someone could help me and kind of explain how to find these... show more I'm an honors student (I don't understand how or why lol) but I don't really a unit that specifies in linear and non-linear function. I need help on how to identify if some equations or graphs are linear or non-linear. It would be great if someone could help me and kind of explain how to find these function. (ex: y=3x(cubed)-3) Thank you!
Update: nvm i got the answer
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