There is nothing particular that can be said about them.
y = 1 - 4x
and y = (x - 4)2/16
have an x-intercept at (0, 4)
and a y-intercept at (1, 0).
But, apart from at these two points, the two behave quite independently.
There is some similarity in the form of the equations but that can be "fixed" by picking more complicated equations.
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There are two possibilities. If the y intercepts are unique, the lines are parallel. If the y intercepts are the same, the lines are coincident. ( They are the same line)
They are parallel lines which have the same slope but different y intercepts.
Parallel lines
No because two lines with the same slope but with different y intercepts are parallel lines. Perpendicular lines meet each other at right angles.
If the lines are straight and have the same slope they are parallel, no matter what the y intercept is