Perimeter = 2(length + width)
Use X for L and W
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2[X + (4X + 8 cm) = 46 cm
2(5X + 8) = 46
10X = 38
X = 3.8 cm
======You figure out the rest.
The length of a rectangle is 8cm more than four times the width. If the perimeter of the rectangle is 46cm, what are the dimensions?
