3x = 5y suy ra \(\dfrac{3x}{15}\)=\(\dfrac{5y}{15}\)

suy ra : \(\dfrac{x}{5}\)=\(\dfrac{y}{3}\)

áp dụng tính chất dạy tỉ số bằng nhau ta có :

\(\dfrac{x}{5}\)= \(\dfrac{y}{3}\)=\(\dfrac{x-y}{5-3}\)=\(\dfrac{16}{2}\)=8

suy ra: \(\dfrac{x}{5}\)=8 suyra x =5.8=40

\(\dfrac{y}{3}\)=8 suyra y =3.8=24