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anonymous
 5 years ago
What method do I use to find the equation of the line normal to the surface z=10x+15y20 at the point (2,0,4)?
anonymous
 5 years ago
What method do I use to find the equation of the line normal to the surface z=10x+15y20 at the point (2,0,4)?

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amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0does "normal to the surface" mean a tangent line/plane?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0No, I would be inclined to think that "normal to the surface refers to I line that is perpendicular rather than tangent. Although this particular lesson does involve tangent lines and such.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0The method is: Your knowledge about the relationship between the equation of a plane and it's normal at a point (a,b,c). So in this case the answer should be: 10(x2)+15(y0)+(z+4)=0

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Correction, should be (z+4)... But you get the point I hope. :)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Sounds like a winner! Thanks
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