Final answer:
The price of 1 order of French fries is $1.25.
Step-by-step explanation:
To find the price of 1 order of French fries, we can set up a system of equations based on the given information. Let's assign variables to the unknowns: let x be the price of 1 hamburger and y be the price of 1 order of French fries. We can now write two equations:
4x + 2y = 16.50 (equation 1)
5x + 3y = 21.25 (equation 2)
To solve this system, we can use either substitution or elimination. In this case, let's use elimination.
Multiplying equation 1 by 5, and equation 2 by 4, we get:
20x + 10y = 82.50 (equation 3)
20x + 12y = 85.00 (equation 4)
Subtracting equation 3 from equation 4, we eliminate x:
(20x + 12y) - (20x + 10y) = 85.00 - 82.50
2y = 2.50
y = 1.25
Therefore, the price of 1 order of French fries is $1.25.