First slide
Introduction to 3-D Geometry
Question

The graph of the equation  y2+z2=0in the three - dimensional space is

Easy
Solution

Sum of squares of two variables is zero implies that each must be equal to zero

Hence,  y2+z2=0implies that  y=0,and  z=0

Therefore, the equation  y=0and  z=0 represents x-axis 

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