Which of the following pairs of linear equations are consistent / inconsistent? If consistent, obtain the solution graphically :`(i)\ \ \ \ \ \ \ x+y=5,\ 2x+2y=10(i i)\ \ \ \ \ \ \ x y=8,\ 3x 3y=16(i i i)\ \ \ \ \ \ 2x+y 6=0,\ \ 4x 2y-4=0(i v)\ \ \ \