Persamaan lingkaran dengan pusat (-1, 1) dan melalui (2, -3) adalah ….   a. x2 + y2 - 2x + 2y  = 21 b. x2 + y2 - 2x + 2y  = 25 c. x2 + y2 - 2x + 2y  = 23 d. x2 + y2 + 2x - 2y  = 23 e. x2 + y2 + 2x - 2y + 5 = 0

answer: 1, 3 and 5 are correct

step-by-step explanation:

question 1 is 8, question 2 is 9, question 3 is 24

step-by-step explanation:

now, the numbers they give you at the top are the key. from there, you just have to plug and chug! let's try 1, 2, and 3!

key: a=3, b=5, c=6

1. a+5

remember, a=3, so we plug that in to get 3+5=8

2. 15-c

c=6, so we plug that in to get 15-6=9

3. 4b

b=6, so we plug it in to get 4*6=24

time to try the rest on your own! if you put the answers below in a comment, i'll check them for you!