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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