Question 954558
W=width; L=length=3W; P=perimeter=2(L+W)=30 inches
P=2(L+W)
30 inches=2(L+W) Divide each side by 2.
15 inches=L+W Substitute for L.
15 inches=3W+W
15 inches=4W Divide each side by 4.
3.75 inches=W ANSWER 1: The width is 3.75 inches.
L=3W=3(3.75)=11.25 inches ANSWER 2: The length is 11.25 inches.
CHECK:
Perimeter=2(L+W)
30in=2(11.25in+3.75in)
30in=2(15in)
30in=30in