Whether it can be equal to that value. For example, if 5 is greater than x, then an open circle will be useful. If 5 is greater than or equal to x, a closed circle will be used.
Y² + 12x - 6y + 21 = 0
<u> - 21 - 21</u>
y² + 12x - 6y = -21
12x + y² - 6y = -21
12x + (y² - 6y + 9) = -21 + 9
<u>12x</u> + <u>(y - 3)²</u> = <u>-12</u>
-12 -12 -12
-x + <u>(y - 3)²</u> = 1
-12
Answer:
D
Step-by-step explanation: