I really don't know how is thia said on English

[Theodora]

I don't know how to sove this.
Here is an example how should be solved. THANK YOU SO MUCH.

 

[lev888]

For any given pair of x,y you need to evaluate both expressions in the parentheses. Then pick the greater of the 2 values. This is the value of the function at (x,y).

 

[JeffM]

They did not ask you to solve it, but to graph it.

How do they want you to graph functions of x and y. I might start with cross sections.

What would the graph look like holding x = 0?

What would the graph look like holding y = 0?

What would the graph look like if x = y?

What would the graph look like if x is held fixed at a value not equal 0?

What would the graph look like if y is held fixed at a value not equal 0?