anonymous
  • anonymous
Find the equation of the plane through (1,2,-1) parallel to the plane 5x+y+7z=20.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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dumbcow
  • dumbcow
wait sorry i think i over complicated it, if its parallel then it will have the same normal -->5x+y+7z = C plug in given point to find C
anonymous
  • anonymous
So, c=0, so the equation would be --> 5x+y+7z=0?
dumbcow
  • dumbcow
yes

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anonymous
  • anonymous
Thanks :) So, all you have to do with these questions is plug in the points?
dumbcow
  • dumbcow
if the planes are parallel, then yes
anonymous
  • anonymous
How about perpendicular?
dumbcow
  • dumbcow
then you have to find a vector that is perpendicular to the normal by setting dot product =0 --> 5a+b+7c = 0 choose a,b,c such that it satisfies equation then new plane is ax+by+cz = C then plug in point
anonymous
  • anonymous
Oh Ok.
anonymous
  • anonymous
Thanks :)

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