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I thought the gradient of y was undefined, not infinity. y*x = -1 y*0 = -1 y = -1/0 Therefore y is undefined. Might be completely wrong here though.

Alright thanks, I'll look into the excel physics. We don't have textbooks yet but I think when we get them it will be the Jacaranda one- not 100% sure though.

Hey guys, I'm in year 11 and I'm really worried about my physics teacher, she's hardly giving any work. I can understand the stuff we do but I just don't feel like it's enough. I have mates in the other physics class and it sounds like they are doing alot more then us. We haven't got textbooks...