1. The problem statement, all variables and given/known data For each of the following equations, without attempting to solve them, determine whether there exists (1) a unique solution, (2) no solution or (3) an infinite # of solutions 2. Relevant equations A) x+y =1 , x=y B) y=x/2 - 1 , 2y = x-2 C) x+y = 1, x+y = 10 3. The attempt at a solution I dont know how to solve this without trying to solve the equations. Are there some types of general guidelines in terms of the number of solutions? For instance in A) I would say there is 1 solution (x,y = 0,5) but thats just because I tried solving it.