Vectors FP3: OCR Watch

SpanishTashman
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Find the equation of the plane which passes through the point (1, 2, 3) and contains the lines of intersection of the planes 2x-y+z=4 and x+y+z=4.

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TeeEm
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(Original post by SpanishTashman)
Find the equation of the plane which passes through the point (1, 2, 3) and contains the lines of intersection of the planes 2x-y+z=4 and x+y+z=4.

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find the line of intersection of the two planes

pick any two sensible points on this line by inspection, say A and B

Find vector CA and CB, where C(1,2,3)

cross CA and CB to find normal to the required plane.

Use any of the three points and normal to find plane
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SpanishTashman
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(Original post by TeeEm)
find the line of intersection of the two planes

pick any two sensible points on this line by inspection, say A and B

Find vector CA and CB, where C(1,2,3)

cross CA and CB to find normal to the required plane.

Use any of the three points and normal to find plane
Is there any way I can ever repay you for this, you are fantastic, thank you so much.

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TeeEm
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(Original post by SpanishTashman)
Is there any way I can ever repay you for this, you are fantastic, thank you so much.

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all good
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