My Math Forum Matrix problem

 Algebra Pre-Algebra and Basic Algebra Math Forum

 December 28th, 2016, 03:27 PM #1 Newbie   Joined: Dec 2016 From: Canada Posts: 5 Thanks: 0 Matrix problem I have a matrix that needs solving to open a Christmas present. Does anyone know how . I have not used that math for forty years and by coincidence I threw that text away only two months ago. Here is a link to the problem. Only one of the three is actually needed to open this box puzzle thing. This is part of an ongoing game that we have played for a number of years. This box might hold another bottle of 18 yr old Bowmore Islay single malt and I could "share" https://drive.google.com/drive/folde...mc?usp=sharing Any help would be greatly appreciated Thanks Norm
 December 28th, 2016, 06:01 PM #2 Senior Member   Joined: Dec 2012 From: Hong Kong Posts: 853 Thanks: 311 Math Focus: Stochastic processes, statistical inference, data mining, computational linguistics You need, for example, to combine A and b together to form an augmented matrix, then apply Gaussian elimination and find the column vectors. The present-giver apparently expects you to use the inverse matrix method for these, though it's a bit cumbersome to do that with these matrices, since there's no shortcut formula for 4x4 Thanks from Joppy
 December 28th, 2016, 06:49 PM #3 Newbie   Joined: Dec 2016 From: Canada Posts: 5 Thanks: 0 My son-in-law was going to be even tougher but it has been 10 years since his masters so he thought he would be " kind". It has been 40 years for me.
December 28th, 2016, 07:01 PM   #4
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 December 29th, 2016, 06:39 AM #5 Newbie   Joined: Dec 2016 From: Canada Posts: 5 Thanks: 0 Whoop hoo Worked like a charm. Thanks very much Norm
December 30th, 2016, 11:37 AM   #6
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Quote:
 Originally Posted by Nheagle Whoop hoo Worked like a charm. Thanks very much Norm
my fee, oddly enough, comes to 3oz of 18 yr old Bowmore Islay single malt

 December 31st, 2016, 09:24 PM #7 Newbie   Joined: Dec 2016 From: Canada Posts: 5 Thanks: 0 And I, kind sir, would be happy to pour you a wee dram. However there was but a lone bottle of beer....Innis & Butt...or something. If your ever out Victoria BC way then stop by for a cold one or eleven! Thanks again Norm Would you care to see the box that was opened? Last edited by Nheagle; December 31st, 2016 at 09:32 PM.
December 31st, 2016, 10:46 PM   #8
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Quote:
 Originally Posted by Nheagle Would you care to see the box that was opened?
Why not

 January 1st, 2017, 07:35 AM #9 Newbie   Joined: Dec 2016 From: Canada Posts: 5 Thanks: 0 A few pics of box added https://drive.google.com/drive/folde...2tZZ2szOUtIdmc Last edited by skipjack; January 2nd, 2017 at 06:36 PM.
January 2nd, 2017, 02:43 AM   #10
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Math Focus: arithmetic, fractions

Quote:
 Originally Posted by Nheagle I have a matrix that needs solving to open a Christmas present. Does anyone know how . I have not used that math for forty years and by coincidence I threw that text away only two months ago. Here is a link to the problem. Only one of the three is actually needed to open this box puzzle thing. This is part of an ongoing game that we have played for a number of years. This box might hold another bottle of 18 yr old Bowmore Islay single malt and I could "share" https://drive.google.com/drive/folde...mc?usp=sharing Any help would be greatly appreciated Thanks Norm

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