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What is the locus of a point for which y...

What is the locus of a point for which `y=0,\z =0?` a. x-axis b. y-axis c. z-axis d. yz-plane

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Locus of the point `y=0, z=0` is x-axis, since on x-axis both `y=0 `and `z=0.`
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