Compare the cross or diagonal terms first.
9x^5*y^4 & 3x --> we can cross out the 3x entirely and change the 9x^5*y^4 into 3x^4*y^4 by dividing 9 by 3 and crossing out one x in x^5.
4y & 2y --> we can change 4y into 2(2y) and cross out the 2y.
Notice by crossing out the 3x and 2y, we are left with 1 / 1.
Thus, we have: 3x^4*y^4 / 2 * 1 / 1 -->
3x^4*y^4 / 2.