Question

How brutus and cassius respont to Anthonys speech

Answer 1

Cassius tells Brutus to prevent him to speak at Caesar’s funeral. He knew that Antony was a great orator and his speech will influence the audience. At this Brutus tells that he will address the public first giving reasons for Caesar’s death. Antony will only speak after him and with their consent

Answer 2

Influnced by Anthony's speech the crowds rushed to burn their homes.
But Brutus and Cassius ran away. 
They went to ASIA to raise army to fight against Anthony and Octavian Caesar(nephew of Caesar)
Brutus sucides here and Cassius is killed and their army is defeated