The ordered pair (x,y) = (8,6) is the solution of the following system of linear equations
x=110y+a,y=110x+b.
Find the value of a+b.
Plug in 8 and 6:
8 = 6/10 + a
6 = 8/10 + b
80/10 - 6/10 = a
60/10 - 8/10 = b
74/10 + 52/10 = a + b
a + b = 12.6
