Please help
in Geometry Answers by

Your answer

Your name to display (optional):
Privacy: Your email address will only be used for sending these notifications.
Anti-spam verification:
To avoid this verification in future, please log in or register.

1 Answer


f(x+y)=x+y+4. It would appear that g(x,y)=f(x+y)=x+y+4.

This would seem to be the equation of a plane: x+y-z+4=0 where z=g(x,y).

There are no constraints on x and y so the domain of x and y are all real numbers and the range of z is infinite (z belongs to the set of real numbers). Given any value for one of the variables, there are always many possible values for the remaining two.

(If y=f(x) then f(x+y)=f(x+x+4)=f(2x+4)=2x+8=2(x+4)=2y. But the question doesn't define y in terms of x.)

by Top Rated User (695k points)

Related questions

1 answer
1 answer
asked Apr 11, 2015 in Other Math Topics by k.g.b Level 1 User (160 points) | 160 views
1 answer
1 answer
Welcome to, where students, teachers and math enthusiasts can ask and answer any math question. Get help and answers to any math problem including algebra, trigonometry, geometry, calculus, trigonometry, fractions, solving expression, simplifying expressions and more. Get answers to math questions. Help is always 100% free!
84,070 questions
89,004 answers
6,767 users