1. The problem statement, all variables and given/known data In R^3, what does the pair of equations y=3 and z=5 represent? In other words, describe the set of points (x,y,z) such that y=3 and z=5. 3. The attempt at a solution I drew out the individual planes y=3 and z=5. i am not sure how to describe the set of all points that satisfy both constraints? I have to have the set of all points such that for ALL x-->y=3 and z=5. Is that a surface? Or a line? I am thinking it has to be a line? thoughts?