Explanation
Step - 1 : Apply properties of y axis.
We know that any point, suppose (x,y) on Y axis will have x=0.
hence, any point on Y axis will be in the form of (0,y).
Step - 2 : Determine the point.
So given that the ordinate is 4.
To be on Y axis it must be of form (0,y).
So simply the point will be (0,4)
Hence, the point with ordinate 4 and on Y axis is (0,4).
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