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Hello.
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So let's consider a ordered triple, some order triple, x, comma, y, comma, z.
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And this given triple is going to represent a point on the, well, on the y axis, on the z axis in the xz plane and in the yz plane.
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So the graph here is shown.
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Now every point on the y axis is of the form, well, zero y zero.
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If on the y axis, the x coordinate and the z coordinate are both zero.
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Now, the restriction made to the triple x, y, z is to make the x coordinate and the z coordinates zero.
00:43
Therefore, we get that x is equal to zero, z is equal to zero, and y is some element of the real numbers.
00:52
Then we get the restriction for x, y, z to represent a point on the y axis...