Answer:
Length = 5
Width = 10
Solution:
Since she is creating rectangular pillow, the perimeter = 2L + 2W or 2(L+W)
L = W - 5
2(L+W) = 30
Substitute W for L
2(W-5+W) = 30
2W - 10 + 2W = 30
Add 10 to both sides
2W + 2W = 40
4W = 40
W = 40/4 = 10
Since we already found the Width, we can now also find the length.
Since L = W - 5, therefore the length of the pillow is 10 - 5 = 5.
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