How were the Greeks able to defeat the Persians?

The Persian army and navy were too weak to win.
The Spartans fought alone without the help of Athens.
Sparta and Athens came together to defeat the Persians.
Athens fought alone without the help of Sparta.

Sparta and Athens came together to defeat the Persians. The Greeks were able to successfully coordinate their forces and strategies to defeat the Persian Empire at the Battle of Plataea in 479 BC, marking the end of the Persian Wars. The combined efforts of both city-states, along with other Greek allies, played a crucial role in the eventual victory over the Persian forces.