senter av serkel is (1,1), radius=5
point (4,-3) is +3 in x direkshun from senter & down 4 in y direkshun
line from senter tu point is down from horizontal bi invers sine(4/5)
or if yuze tangent, slope=deltay/deltax=-4/3
Tangent tu serkel is at 90 deg tu radius, so its slope=+3/4
tangent: y=(3/4)x +konst
tu get konst, projekt line tu x=0...deltax=-4,
deltay=slope*deltax=-4*(3/4)=-3
y-intersept av tangent=-3-3=-6
tangent line...y=(3/4)x-6