SOLUTION: Determine whether the graphs of the following equations are parallel or perpendicular. Explain. 3X-9Y= 9, 3Y=X +12, 2X- 6Y= 12

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Question 1099622: Determine whether the graphs of the following equations are parallel or perpendicular. Explain. 3X-9Y= 9, 3Y=X +12, 2X- 6Y= 12
Answer by josgarithmetic(39620)   (Show Source): You can put this solution on YOUR website!
3X-9Y= 9,   3Y=X +12,   2X- 6Y= 12

Basic Rule: slopes equal means lines parallel (unless the two lines are the same); slopes which are negative reciprocal of each other are perpendicular.

Slopes of your lines in order given:
1/3,   1/3,   and 1/3
.
(Are any pair of your lines the same line?)

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