Given, lines are 5x+6y−34=0.....(i) and 2x+y+c=0......(ii) Here, l1=5,m1=6,n1=34 l2=2,m2=1,n2=c And given circle x2+y2−8x−10y+25=0 Here, centre =(−g,−f)=(4,5) and radius=√g2+f2−c =√16+25−25=4 Since, Eqs. (i) and (ii) are conjugate lines with respect to given circle