решите графическим методом систему уравнений и найдите координаты точки пересечения графиков функции Y равно 9 - 9 x ;9x - y равно 9​. это не английский а алгебра

Nowadays, environmental problems are the most burning for the society. Air, water, land and nuclear pollution badly damage the nature. People cut down trees and destroy the habitat of thousands of animals. As a result, many species are in danger of extinction. Factories pollute our rivers and lakes with dangerous chemicals. The increasing number of cars in towns and cities has led to the growth of harmful gases in the atmosphere. There is much litter everywhere, our parks and forests are full of rubbish.

I used to have a dog when I was a child
He used to be noisy when he was young
She used to go to the country when she was 7
I used to walk many years ago
They used to drive fast when he was 20
Did you use to have a dog?
Did she use to go to the country?
Did he use to drive fast/
Did they use to walk 5 years ago?
Did you use to play tennis 5 years ago?
I didn't use to walk when I was 5
He didn't use to drive when he was 18
She didn't use to go to the country when she was 7
My mother didn't use to play tennis when she was a pupil
He didn/t use to have a dog