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January 31, 2015

January 31, 2015

Posted by **Samantha** on Sunday, April 8, 2012 at 2:55am.

- Calculus -
**Reiny**, Sunday, April 8, 2012 at 8:04amYou have to look at their direction numbers

direction of L1 is (-1,3)

for L2, the direction is (3,1)

since (3,1)**⋅**(-1,3) = 0 , they are perpendicular.

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