Need Help With A Trig Exam See Document Attached Thank You

Need help with a trig exam, see document attached. 
Thank you.
5.1 x +0 y +2 z=−7→ x +2 z =−70 x+1 y +0 z=9 → y=9 z=tx+ 2 z=−7 → x +2 t=−7 → x=−7−2t Solution: There are infinitely many solutions. The solutions are ( x , y , z )…
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