Question 751689
Determine whether the lines x-5y=15  and -5x-y+2=0 are parallel, perpendicular, or neither.
I really need help with this one. Kim	


x - 5y = 15 has a slope of {{{1/5}}}, while - 5x - y + 2 = 0 has a slope of {{{- 5}}}. 


Since these two slopes are negative reciprocals of each other: {{{1/5}}} and {{{- (5/1)}}}, then the slopes are perpendicular to each other.