Alright, lets get started.
Two lines are given.

and

If we need to find the intersection point of these two lines, we must solve these two equations and find (x,y) values.
From the first equation,

Adding y in both sides

x = y
We could put this value in second equation



Dividing 11 in both sides

x = -2
So,
y = x means
y = -2
(x,y) = (-2,-2) : Answer
Hope it will help :)