SOLUTION: 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

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
Found 2 solutions by tommyt3rd, MathTherapy:
Answer by tommyt3rd(5050) (Show Source): You can put this solution on YOUR website!
x-5y=15 has

and -5x-y+2=0 has

and so

they are perpendicular

:)
Answer by MathTherapy(10555) (Show Source): You can put this solution on YOUR website!
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 , while - 5x - y + 2 = 0 has a slope of .

Since these two slopes are negative reciprocals of each other: and , then the slopes are perpendicular to each other.
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