ksharma12 wrote:

How did u know that y was less than 0?

I am confused on the modules.

Isnt the process of doing these problems is x<0 and X>0?

In this case y + y =0 , 2y=0 , y=0 for x>0

and

y-y=0 , 0=0 , 0 for x<0

I am missing something here. My foundation for understanding these problems is wrong...

You're missing the concept of absolute values. Absolute value is basically, "distance from zero". So |-3|=3, |-2|=2, |2|=2, etc.

Understand this and the problem will seem very simple to you.