4(1)-3(2)Β Β [-4 is the coefficient of y in (2), -3 is the coefficient of y in (1) ] 28x-12y = 16...........(1a) 6x-12y = 3...............(2a) Subtract 22x = 13 solve x=13/22 ....................(3)
Substitute (3) in (1) 7(13/22)-3(y)=4 solve for y 91/22-3y=4 3y=(91-88)/22=3/22 y=1/22