a. What does the equation x=4 represent in R2? Whatdoes it represent in R3? Illustrate with sketches.



b. What does the equation y=3 represent in R3? Whatdoes z=5 represent? What does the pair of equations y=3 and z=5? Inother words, describe the set of points (x,y,z) such that y=3 andz=5. Illustrate with a sketch.