Exercise 5 Page 5

Remember that π is a constant and not a variable. Keeping that in mind, we can solve the given equation for x by dividing both sides by π. We want to divide because multiplication and division are inverse operations — they cancel each other out. This is allowed by the Division Property of Equality.

We will check our solution by substituting this result back into the original equation and simplifying. If doing so results in an identity, our solution is correct.

Since substituting x=9 resulted in an identity, our solution is correct.