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