Explanation:
so,
x²y³ = 10
x³y² = 8
what is the value of x⁵y⁵ ?
don't you see right away that 2+3 and 3+2 both equal 5 ?
so, x³x² = x⁵
y²y³ = y⁵
so, I only need to multiply both equations with each other. and I get
x²y³×x³y² = 10×8
x⁵y⁵ = 80
why ? because multiplications and exponents (which are nothing else than multiplications) are all communicative :
a×b = b×a.