Question

What is the equation for a circle with its center at the origin and a tangent whose equation is y=7?

Answer 1

tangent to y=7 actually tells you the radius already.

Answer 2

OKAY'

Answer 3

just don't forget to square it (-:

Answer 4

so it y=49

Answer 5

(x - 5)2 + (y + 2)2 = 49 (x + 3)2 + (y - 3)2 = 49
x2 + y2 = 49

Answer 6

a(x - 5)2 + (y + 2)2 = 49 b(x + 3)2 + (y - 3)2 = 49
cx2 + y2 = 49

Answer 7

the equation of a circle looks like this
\[ f(x,y)=(x-u)^2+(y-v)^2 = r^2 \] in this case (u,v) is the origin and therefore (0,0)

Answer 8

so its c

Answer 9

exactly

Answer 10

thanks alot