Question

Which line is perpendicular to the line y=3x/8+2

Answer 1

to find the perpendicular line you must have the slope and a point on the given line. here you're missing the point.

but in general to find any perpendicular line equation you must follow these steps:
1. Compute the slope of given line equation here (y=3x/8+2)
2.Compute the slope of the perpendicular line m_p=-1/slope of the given line
3.Compute the perpendicular line equation y=mx+b for slope m_p(found in step2) and passing through the point.

but you don't have the point here so you can't find the value of b for the perpendicular line equation.

Answer 2

Hope this would help you :)