Given:
Price of sofa is $900 more than price of a chair.
Total price of sofa and chair = $1200
Let S represent sofa
Let C represent chair.
We have the following:
Equation for total price: S + C = 1200
Equation given Price of sofa is $900 more than price of a chair: S = C + 900
Therefore, the system of equations that can be used to find the piece of each furniture are:
S = C + 900
S + C = 1200
ANSWER:
S = C + 900
S + C = 1200