SOLUTION: Does the product of gradients of two perpendicular lines always -1 ? If it does, then will this following pair be a contradiction: x=a and y=d for any values of c and d ?

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Question 978325: Does the product of gradients of two perpendicular lines always -1 ? If it does, then will this following pair be a contradiction: x=a and y=d for any values of c and d ?
Answer by Edwin McCravy(20055) About Me  (Show Source):
You can put this solution on YOUR website!
Does the product of gradients of two perpendicular lines always -1 ? 
When they both have a gradient, then yes.

If it does, then will this following pair be a contradiction: x=a and y=d for any
values of c and d ?
No, because x=a has no gradient.

Edwin