Question 130423
Lines are perpendicular if and only if their slopes are negative reciprocals of each other, that is {{{m[1]=-1/m[2]}}}.  All you have to do is put the given equation into slope-intercept form by solving the equation for y.  Once you have done that, the coefficient on x will be the slope of the given line.  Take the negative reciprocal (turn the fraction over and put a minus sign in front of it) and you have your answer.