Answer:
a = 1/2
Step-by-step explanation:
X+y=4 :x=4-y,yR
x-y=6:x=6+y,yR
Answer:
Step-by-step explanation:
The standard form of a circle's equation is
where h and k are the circle's center and r is the radius. We are told, and we can see, that the center of the circle is (0, 0) so h = 0 and k = 0. The radius, given as 4, goes into the equation squared, so the equation is
which simplifies down to
, choice C.
