Question 941930
width=W length=L=W+10
P=2L+2W=2(L+W)
22=2(L+W) divide both sides by 2
11=L+W Substitute for length
11=W+10+W
11=2W+10 Subtract 10 from each side 
11-10=2W+10-10
1=2W divide both sides by 2
1/2=W
L=W+10=10 1/2
CHECK:
P=2(L+W)
22=2(10  1/2 + 1/2)
22=2(11)
22=22