Question 911117
x, how many calories in 1 shot
y, how many calories in 1 small can
Reason for those variable assignments is the question, "how many calories in each drink?"


y=5+7x and x+y=181.


When the variable assigning and the equations make sense to you, you are ready to just solve the system of those equations for x and y.  A simple substitution is easy to do.