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4. We know that x + y = 4 describe a circle of radius 2 centered at (0,0) in plane. a) What do the

4. We know that x + y = 4 describe a circle of radius 2 centered at (0,0) in plane. a) What do the following two equations x + y = 4 and z= 0 describe in space? b) What do the following two equations x + y = 4 and z=1 describe in space? c) What does the equation x+ y = 4 describe in space?

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