Display the values of the functions in two ways: (a) By sketching the surface z = (x, y) and (b) By drawing an assortment of

Display the values of the functions in two ways: 

(a) By sketching the surface z = ƒ(x, y) and 

(b) By drawing an assortment of level curves in the function’s domain. Label each level curve with its function value.

ƒ(x, y) = 1 - |y|