http://i1209.photobucket.com/albums/...g?t=1333868898 I've tried this problem about 6 times and can't get the right answer in the book, can someone please show me how to do this...
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Originally Posted by batosaims http://i1209.photobucket.com/albums/...g?t=1333868898 I've tried this problem about 6 times and can't get the right answer in the book, can someone please show me how to do this... Multiply 2nd. by -3 and add to the 1st. ,also..multiply 2nd. by 4 and add to the 3rd. : Add 2nd to the 3rd. : So , solution of the system is :
Originally Posted by princeps Short cut; add 1st 2 equations to get: 4a + 2b - 2c = 2 ;add to 3rd equation: -4a+ 6b +2c = -6 ============= 8b = -4 b = -1/2 (as per Princeps)
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