PLEASE ANSWER!! What did Tiberius Gracchus leader do that went AGAINST the principles of sharing power?

Explain how these actions led to the end of the Roman Republic and the beginning of Rome being under one-man rule.

The Gracchi brothers, Tiberius and Gaius, introduced a number of populist agrarian and land reforms in the 130s and 120s BCE that were heavily opposed by the patrician Senate. Both brothers were murdered by mob violence after political stalemates.

the answers are 1 and 4

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.