1.(x+y) /(2x+y) = 4/5 5(x+y) = 4(2x+y) 5x+5y = 8x +4y y = 3x ⇒x/y = x/3x =!/3 2. (3x+4y) /(2x+y) = 7/3 3(3x+4y) = 7(2x+y) 9x+12y =14x+7y⇒5y=5x⇒x=y⇒ x/y=1/1 3. (6x+4y)/(5x+2y) =3/2 2(6x+4y)=3(5x+2y) 12x+8y=15x+6y ⇒2y=3x⇒x/y=x/(3x/2)=2/3 4. (5x-4y)/(2x-y)=7/3 3(5x-4y)=7(2x-y) 15x-12y=14x-7y⇒x=5y⇒x/y=5y/y =5/1