SOLUTION: Are the two functions parallel, perpendicular, the same equation, or none of these choices? -x-3y= -18 9x-3y= -27

Question 754357: Are the two functions parallel, perpendicular, the same equation, or none of these choices?
-x-3y= -18
9x-3y= -27
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Are the two functions parallel, perpendicular, the same equation, or none of these choices?
Solve for y:
-x-3y= -18 --> y = (-1/3)x + 6
Slope = -1/3
-----------------
9x-3y= -27
3x - y = -9
y = 3x + 9
------------
Slope = 3
=============
The slopes are negative inverses --> perpendicular
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