SOLUTION: please see the link
http://www2.edmastery.com/files/nnds_prod_data/itemAssets/nnds_li%20-%20production%5Cdantonm%5C6_2_2_18.jpg
Algebra.Com
Question 254898: please see the link
http://www2.edmastery.com/files/nnds_prod_data/itemAssets/nnds_li%20-%20production%5Cdantonm%5C6_2_2_18.jpg
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
B) the angle between the planes is 90, which makes it perpendicular.
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