## Elementary Algebra

$-6y^9$
RECALL: (i) $\dfrac{a^m}{a^n} = a^{m-n}$ (ii) $a^0=1, a\ne0$ Divide the coefficients, and then use the rules above to obtain: $=-6x^{4-4}y^{9} \\=-6(x^{0})y^9 \\=-6(1)y^9 \\=-6y^9$