Definition: A function of the form
z(x,y)=c,
where c is a number, is called a constant function.
Remark: The graph of a constant function of two variables is a horizontal plane.
Example: The function z(x,y)=3 is an example of a constant function.
z(x,y)=c,
where c is a number, is called a constant function.
Remark: The graph of a constant function of two variables is a horizontal plane.
Example: The function z(x,y)=3 is an example of a constant function.
