amp;dxdy=x−yx+y−2amp;x=X+h,y=Y+kamp;dXdY=X−YX+Yamp;h+k−2=0 h−k=0}h=k=1amp;Y=vXamp;v+dXdv=1−v1+v⇒X−dXdv=1−v1+v2amp;
amp;1+v21−vdv=XdXamp;tan−1v−21ln(1+v2)=ln∣X∣+C
As curve is passing through (2,1)
amp;tan−1(x−1y−1)−21ln(1+(x−1y−1)2)=ln∣x−1∣amp;∴α=1 and β=2amp;⇒5β+α=11