2x 4 )( 3x 12 )= 0 July 8, 2019 16 32 64 128 2x 4 3x 3 24x 2 13x 12 0 2x 5y 12 3x 2y 4 0 by substitution method 2x y = 4 3x 4y = 12 x = 0 y = 0