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Algebra 2

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Before I go on and give you the problenms let me explain. i am not some lazy kid trin to get people to do my homework over the internet. I am freshman that just recently skippeda garde in math and I need some help. The problems below are from my pop quiz out of the text book i gotta hand in on monday. I can't ahve my aad or mom checkin this cause they have no clue on this but i did the problems and need feed bac.

solve the system using linear combination method
12. 3x+ 2y-z=8

(my answer was (1,1,-3))

16. x+y-2z=5

(my answer was infinite solution)

18. -2x+y+6z=1

(my answer was in fraction form but she said no solutions were fractions)

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