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Equation normal to plane

 
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Jun9-12, 08:21 AM   #1
 

Equation normal to plane

I'm having trouble finding the equation normal to the plane for part (ii).

The vector equation I got for part (i) is r=(1/2,1,2/3) + t(3/2,2,-2/3). How do you deduce the normal vector from this? The answer is the vector (9,12,-4). I've tried anything but don't know where they got this result.

Thanks
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Jun9-12, 02:33 PM   #2
 
They used your (3/2,2,-2/3) and multiplied by 6 to clear the denominator.
 
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