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January 28, 2015

January 28, 2015

Posted by **Derek** on Wednesday, July 9, 2008 at 8:07pm.

2x − 5y + 3z = −10

3x + 6y + 3z = −6

3x − 4y + z = −1

- Calc. -
**Reiny**, Wednesday, July 9, 2008 at 9:57pmNone of the normals are scalar multiples of each other, so none of your planes are parallel

If we multiply the third equation by 3 we get 3z in all three equations.

#2 - #1 gave me x+11y = 4

the new #3 - #2 gave me 6x - 18y = 3

solving those two equations in x and y gave me x = 5/4 and y = 1/4

subbing that back into one of the originals I got z = -15/4

So your 3 planes intersect in a point, namely (5/4,1/4,-15/4)

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