The equation of the line is y = x+1.
What are parallel lines?
Two lines are said to be parallel if they do not intersect each other at any point in the plane.
Let the equation of the line
y-y₁=y₂-y₁/(x₂-x₁)(x-x₁)
Since the line passes through (1, 2),
y-y₁=2-y₁/(1-x₁)(x-x₁)
The line crosses the y axis at y = 1.
y-1 =2-1/(1-0)(x-0)
y-1 =2+x
y = x+1
Hence, the equation of the line is y = x+1
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