Answer :
Given:
Distance from the line 
is 4.
To find:
Points on y-axis
Concept Used:
Distance of a point from a line.
Explanation:
Let (0, t) be a point on the y-axis.
It is given that the perpendicular distance of the line 
from the point (0, t) is 4 units.
∴
⇒ 
⇒ 
⇒ 
⇒ t
⇒ t
⇒ t
Hence, the required points on the y-axis are 
and 
.
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