0 8 x 7 4 July 8, 2019 16 32 64 128 X 0 4 8 0 7 x 3 X 8 6x 4 7 0 2 8 0 7 x 8 4 2x 3y 8 0 x 4y 7 0 2x 3y 8 0 x 4y 7 0 by substitution method 2x 5y 8 0 x 4y 7 0 by substitution method 2x 5y 8 0 x 4y 7 0 2x 5y 8 0 x 4y 7 0 by cross multiplication 2x 5y 8 0 x 4y 7 0 by elimination method 0 8 x 7 0 8 x 70