5x 4 0 )= 20 July 8, 2019 16 32 64 128 5x 4 15x 2 20 0 5x 4 20x 2 0 5x 4 20x 3 0 X x 4 )- 5x 20 0 5x 4y 4 0 x 20 12y 5x 4y 4 0 x 20 12y by elimination method 5x 4y 20 4 0 5 x 0