derminant..........,...........
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delta =2(0x1-2x-2)-1(-1x1-2x-1)+0(-1x-2-0x-1)= 7
therefore
7x = 5 hence x = 7/5
7y = -3 hence y = -3/7
7z = -1 and hence z = -1/7
therefore
7x = 5 hence x = 7/5
7y = -3 hence y = -3/7
7z = -1 and hence z = -1/7
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