The deck and the living room combine to form a rectangle. Write an expression that represents the combined length of the living room and deck.

12 ft living room

Deck 14ft d

Write an expression to represent the combined area of the living room and deck.

Write an expression to represent the area of the living room plus the area of the deck.

Will both expressions give you the same answer if you knew the value of d?

5 How do you know WITHOUT plugging in a value for b?