Question 1096405
How would you choose to reduce the system shown to a 2 × 2? Explain why you would choose this approach. 
–3x + y – 2z = 10         (1)
5x – 2y – 2z = 12         (2)
x – y + z = 23         (3)
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I would eliminate y or z.
There's no advantage to either.
Eliminating x would require more work.