Question 4713
Let x = number of cheeseburgers
y = number of orders of fries


4x + 3y = 11.45
2x + y = 5.13


Multiply each side of the second equation by -3:
4x + 3y = 11.45
-6x - 3y = -15.39


-2x = -3.94


Divide each side by -2, 

{{{x = -3.94/-2}}} = $1.97


Substitute into the second equation:
2x + y = 5.13
2(1.97) + y = 5.13
3.94 + y = 5.13


Subtract 1.94 from each side:
3.94 -3.94 + y = 5.13 - 3.94
y = $1.19


Check in first equation:
4x + 3y = 11.45
4(1.97) + 3(1.19) = 11.45
7.88 + 3.57 =$11.45


Cheeseburger = $1.97
Fries = $1.19


R^2 at SCC