The Function (#,Y) = X + Y + 3xy +52 + 5y + 3 Increases Most Rapidly At The Point P(1,1) In The Direction 12 I+ 13 J The Rate Of Increase At P In This Direction Is Sqrt313 The Rate Of Increase At P In The Direction Of The Point Q(2, 3) Is 15 The Equation Of The Tangent Line To The Level Curve F(X,Y) = 18 At The Point P Is 12 (2-1)+ 13 (Y-1) = 0