To calculate the price of each item, we will need to establish equations. Based on the problem, there are three unknowns, thus three equations are required. We formulate the equations as follows: let x = cost of small pizzas, y = cost of soda, z = cost of salad. Two small pizzas, a liter of soda, and a salad cost $14, leading to the equation 2x + y + z = 14. One small pizza, a liter of soda, and three salads cost $15, resulting in x + y + 3z = 15. Lastly, three small pizzas, a liter of soda, and two salads cost $22, giving us 3x + y + 2z = 22. By solving for x, y, and z, we find: x = $5, y = $1, z = $3.
