How did the Aztecs overcome the fact that much of Mexico was not good for farming?

I can't give you a definite answer because I don't know but I can give you an educated guess. Alright let's get something straight, nobody liked the Aztecs when they were around since they did a lot of conquering and human sacrifices. I can infer that they robbed a whole lot of people and sustained themselves that way.

I did some research, apparently they used two methods of farming to combat the issue they used the methods called chinampas and terraced farming

Chinampas farming: "A Mesoamerican method of agriculture, chinampa is an artificial cultivation system built in areas where water is the main natural resource present in the environment." -Google

Terraced farming: "Terrace farming is the practice of cutting flat areas out of a hilly or mountainous landscape in order to grow crops. It is a practice that has been in use from the rice fields of Asia to the steep slopes of the Andes in South America." -Google

the correct answer is the following is a list of inventions made in the medieval islamic world, especially during the "islamic golden age" (8th to 13th centuries),[1][2] as well as the late medieval period, especially in the emirate of granada and the ottoman empire.

science and technology in the islamic world adopted and preserved knowledge and technologies from contemporary and earlier civilizations, including persia, india, china, and greece-roman antiquity, while making a number of improvements and innovations.

answer; environmental science;