Re: Defining a function

*To*: mathgroup at smc.vnet.net*Subject*: [mg28590] Re: [mg28572] Defining a function*From*: BobHanlon at aol.com*Date*: Mon, 30 Apr 2001 03:02:02 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

b[a_, x_] := Evaluate[b /. Solve[{a == x+y, b == x*y}, b, y][[1]]]; b[a, x] (a - x)*x Bob Hanlon In a message dated 2001/4/28 9:45:39 PM, yarblocks at yahoo.de writes: >I have for example: > >a = x + y and >b = x*y > >whats the procedure to express b as a function of a in Mathematica? >