# How do you simplify y^-7?

${y}^{- 7} \equiv \frac{1}{y} ^ 7$
For any $a$ raised to a negative power $- m , m > 0$, we can rewrite ${a}^{- m} \equiv \frac{1}{a} ^ m$
$\therefore {y}^{- 7} \equiv \frac{1}{y} ^ 7$