Posted by **Lisa** on Saturday, September 5, 2009 at 11:50pm.

Determine whether the lines are parallel, perpendicular, or neither.

y = 9x + 9 and y = -9x + 9

Is this perpendicular since they go across from each other

- Algebra -
**drwls**, Saturday, September 5, 2009 at 11:53pm
The answer is neither. For the lines to be perpendicular, the product of the slopes, which are coefficients of the "x" terms, must be -1. In this case the product is -81.

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