Question 275511
Yes, centre is (0,0) and the radius is 5. Thus we have a 3,4,5 triangle to play with.
Angle at centre is arctan 4/3 = 53.13 degrees.
Gradient of line from centre to tangent point is 4/3
Gradient of line of the tangent is therefore -3/4
So line is 4y + 3x = c
At 3,4   we get 16 + 9 = c = 25
Line is thus 4y + 3x = 25
(This means is cuts the y-axis at 25/4)