Answer:
I think B.
Step-by-step explanation:
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Explanation is given in the above photo.
12 meters
2x9=18 (get both widths)
42-18=24 (take away widths of 9m)
24/2=12 (divide by 2 to get one length)
Answer: 7x+y=-6
Step-by-step explanation: Hope <em> I helped</em>
