hi i need help with finding optimum maximum/minimum of this function:

http://i33.photobucket.com/albums/d98/braddpit/func.jpg

subject to these constraints:

http://i33.photobucket.com/albums/d9...dpit/const.jpg

i've got this far:

http://i33.photobucket.com/albums/d98/braddpit/sol.jpg

now, if 0=0 that means that there are infinite number of solutions, i think its not logical and i've probably had a calculus error...

plz help