Answer:
B
Step-by-step explanation:
The equation of a circle in standard form is
(x - h)² + (y - k)² = r²
where (h, k) are the coordinates of the centre and r is the radius
To obtain this form use the method of completing the square
Given
x² - 8x + y² - 2y - 8 = 0 ( add 8 to both sides )
x² - 8x + y² - 2y = 8
add ( half the coefficient of the x/y terms )² to both sides
x² + 2(- 4)x + 16 + y² + 2(- 1)y + 1 = 8 + 16 + 1
(x - 4)² + (y - 1)² = 25 → B
The rule for a 90 degree rotation is
(x,y)——>(-y,x)
So let’s take the coordinate (-5,-1) and let’s replace the x and y places together!!!
So that would give us -1•-1 which is just 1
Then -5•1 which is just -5
So the answer is
(1,-5)
Please finish the question and i will be able to help
