Answer 1

Find the derivative to get the slope of a tangent line. then plug in your point 1,2

Answer 2

Are you in calculus?

Answer 3

Ok. so apply the derivative rules. y^3 + x^2y^2 - 3x^3 = 9 becomes 3y^2 +2x2y(?)-9x^2=0? I think. There may be a different rule for the middle term. I can't remember...