Question

The length of a rectangular field is seven meters less than four times the width. The perimeter is 108 meter. Find the width and length of the field. How do I do this?
2l+2w=108
=2(4w-7)+2w=108
=8w-14+2w=108
=10w-14=108
=10w=122
=w=12.2m
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2l+2w=108
=2l+2(12.2)=108
=2l+24.4=108
=2l=83.6
=l=41.8m

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