Answer:
140 in
Step-by-step explanation:
x = length
y = width
x = 6y
area = x × y = 600 in² (I hope you forgot to put the ² on the in and not your teacher).
perimeter = 2x + 2y
using the first equation as substitute in the second equation we get
6y × y = 600
6y² = 600
y² = 100
y = 10 in
x = 6y = 6×10 = 60 in
perimeter = 2×60 + 2×10 = 120 + 20 = 140 in
