Dear math934,

In the article that you have refered the given solution is a paricular solution. There are other solutions as well. For example,x= 40/3,y= 22,z= 4 is another solution. If you are given three equations with three unknows you would get only one solution which satisfies all the three equations. But in this case since only one equation is given there are infinte number of solutions.

Do you have any more questions?