If (x,y)=(8,2) is the solution of the pair of linear equations mx+y=2x+m=10,then m+n is equal to

(a): Given, (x,y)=(8,2) and mx+y=2x+2n=10 ∴m(8)+2=2×8+n=10 ∴8m+2=10 and 16+n=10 ⇒m=1 and n=−3 ∴m+n−1−3=2