You can put this solution on YOUR website! slope of this line is chg y/chg x =(3/4)
perpendicular is negative reciprocal or -4/3 That is your answer.
To prove it:
use point slope formula with that
y-y1=(-4/3) (x-x1)
y-6=(-4/3)(x-6)= -(4x/3)+8. Note, you may use either point.
y=(-4/3)x +14
equation of original line is y=(3/4)x-3/2+3=y=(3/4)x+(3/2)