The Algebros are visting Michigan State University when they stumble upon a Girl Scout selling cookies. Sully orders 3 boxes of Tagalongs and 4 boxes of Somoas for $26. Brust isn't statisfied with
such a small order and yells "UPGRADE!!" He then upgrades the order to 5 boxes of Tagalongs and
6 Boxes of Somoas which costs $41.

a. Write a system of linear equations to model the situation.
(Let x = cost of a box of Tagalongs and y = cost of a box of Somoas.)

b. Solve your system of equations above using elimination to find the cost of each type of cookie.