The lines x \equal{} \frac 14y \plus{} a and y \equal{} \frac 14x \plus{} b intersect at the point (1,2). What is a \plus{} b?
<spanclass=′latex−bold′>(A)</span>0<spanclass=′latex−bold′>(B)</span>43<spanclass=′latex−bold′>(C)</span>1<spanclass=′latex−bold′>(D)</span>2<spanclass=′latex−bold′>(E)</span>49