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Trigonometry Questions

Solve the system x-2y+z=-1 and system x+2y-2z=-1
-2x+3y+2z=4 x+3y+z=10
2x+y+3z=9 2x+6y+2z=20

Find the maximum value of c=6X + 5y on the region determined by the constaints
3x+2y+>or equal to 20
2< or equal to X<or equal to 8
1< or equal to y <or equal to 10

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