Question 996762
x = cost of a small box.
y = cost of a medium box.


7x + 9y = 50
5x + 10y = 33


you need to solve these two equations simultaneously.


you can graph these equations and look for the intersection.


the graph is shown below:


<img src = "http://theo.x10hosting.com/2015/101502.jpg" alt="$$$" </>


they intersect at the point (x,y) = (8.12,-.76).


since both x and y have to be positive, the solution is invalid.


you have no solution to this problem as given.