5 x 2 y 15 xy 2 July 8, 2019 16 32 64 128 Factorise 5x 2 y 15 xy 2 5 x y 1 xy 2 15 x y 5 xy =- 2 10 x y 2 xy 4 15 x y 5 xy =- 2 10 x y 2 xy 4 15 x y 5 xy =- 2 teachoo 10 x y 2 xy 4 15 x y 5 xy =- 2 by elimination method 10 x y 2 xy 4 15 x y 5 xy =- 2 by substitution method 10 x y 2 xy 4 15 x y 5 xy =- 2 by cross multiplication X+y 2 5+z xy
