Question 452463
The condition that two lines to be perpendicular is that the product of their 

slopes equal to -1. In our case the slope of the given line is {{{m[1]=3}}}

The slope of the perpendicular line will be:{{{3*m[2]=-1}}} or {{{m[2]=-(1/3)}}}

and its equation:{{{y=(-1/3)x+b}}}, where b is a real number.