A photo studio offers portraits in 8 X 10 and wallet-sized formats. One customer bought two 8 x 10 portraits and four wallet-sized portraits
and paid $52. Another customer bought three 8 x 10 portraits and two wallet-sized
portraits and paid $50. What is the cost of an 8 x 10 portrait? What is the cost of a
wallet-sized portrait?
• Can you eliminate a variable simply by adding or subtracting?
• If not, how many of the equations do you need to multiply by a constant?