SOLUTION: could you please explain this question to me please convert |x|+|y| into piecewise expression for different values of x and y

f(x,y) = |x|+|y|

There are 4 cases

Case 1. , 

Then f(x,y) = |x|+|y| = x+y

Case 2. , 

Then f(x,y) = |x|+|y| = x-y

Case 3. , 

Then f(x,y) = |x|+|y| = -x+y

Case 4. , 

Then f(x) = |x|+|y| = -x-y 


 
Edwin