Question

Find the coordinates of all points on the graph of y =1 - r^2 at which the tangent line passes through the point (2,0)

Answer 1

\[y = -r^2 -1\]
\[y \prime=-2r\]
At r = 2 --> -4
The at (2,0) will be -4.

y = mx+b
0 = -4(2)+b
0 = -8+b
b = 8

y=mx+b
y=-4x+8

Answer 2

hmm i got it thanks :D