Solve Problems Using Systems of Linear Equations
-A Rectangular Lot $\$ 21$

Solve Problems Using Systems of Linear Equations
-A rectangular lot whose perimeter is 400 feet is fenced along three sides. An expensive fencing along the lot's length costs $\$ 21$ per foot, and an inexpensive fencing along the two side widths costs only $\$ 10$ per foot. The total cost of the fencing along the three sides comes to $\$ 4140$ . What are the lot's dimensions?

A) Length $140 \mathrm { ft }$ ; Width $60 \mathrm { ft }$
B) Length $143 \mathrm { ft }$ ; Width $57 \mathrm { ft }$
C) Length $135 \mathrm { ft }$ ; Width $65 \mathrm { ft }$
D) Length $280 \mathrm { ft }$ ; Width $120 \mathrm { ft }$