Can two lines be perpendicular but have to same y intercept

Yes, it can

Step-by-step explanation:

If two lines are perpendicular, that means that the slopes have to be negative and reciprocal (example, 4 and - 1/4)

That means that the y intercept can be unaffected.

Example:

y=3/4x+2

y=-4/3x+2

They're still perpindicular.