Does (-2x+y=6)+ (y-2x=4) have no solution?
assuming you are askingdoes -2x+y=6 and y-2x=4 have a solutionlook at themrewrite first equation by switching x and yy-2x=6 and y-2x=4false since they are same valuesthere is no solutionthese 2 lines are paralellNO SOLUTION