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# A point is is $XZ$ plane. What can you say about its $y$ coordinate?

$\begin{array}{1 1}\text{zero} \\ \text{any real number } \\ \text{any real number other than zero} \\ \text{cannot say}\end{array}$

Any point on $XZ$ plane will have $x$ and $z$ coordinate.
But its $y$ coordinate is zero
That is it will be of the form $(x,0,z)$.