Answer:
3x-y-2z=4. 2x+3y-4z=1
4x-7y-6z=-7. -x+6y+4z=11
- +. +. +. x+9y=12
____________.
-x +6y +4z=11.
It is twice the area of a rectangle of length 4 units and width 2 units.
Step-by-step explanation:
brainly.com/question/15786874
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