Question 2277
 Check the signs in the first problem and resubmit.

2)  A + B = 6   ......(1)
   2A + B = 8   ......(2)
   (2) - (1), we get
   A  = 2
   By substituting the value of A in Eq.(1),
   2 + B = 6
  So B = 6-2 = 4

   A = 2;   B = 4.    Ans. 
 
    In the first step, we have eliminated one variable (B) by subtracting.
    In the second step, we have substituted the value of A and solved.