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January 29, 2015

January 29, 2015

Posted by **Anonymous** on Tuesday, January 29, 2013 at 7:41am.

- maths -
**Reiny**, Tuesday, January 29, 2013 at 8:02amI assume you mean

(x+1)/-3 = (y-3)/2 = (z+2)/1 , the brackets are essential

so we know (-1,3,-2) is a point on the plane and we also have a direction vector of [-3,2,1]

using (0,7,-7) we can find a second direction vector which would be

[1,4,-5]

a normal to [-3,2,1] and [1,4,-5] is [-14, -14 , -14]

or reduced to [1,1,1]

So the equation of the plane is

x + y + z = c, but -1,3,-2) lies on it

-1 + 3 - 2 = c = 0

equation of plane:

x+y+z = 0

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