Question

is this a circle graph? (-7,-9) radius of 49?

Answer 1

Not enough information

Answer 2

x squared plus y squared minus 14x -18y plus 81 equals zero

Answer 3

yes this is a circle but the radius is 7

Answer 4

no hold on - the center is at (7,9)

Answer 5

x^2 + y^2 - 14x - 18x + 81 = 0
complete the square:
(x - 7)^2 - 49 + (y - 9)^2 - 81 + 81 = 0
(x - 7)^2 + (y - 9)^2 = 49

- this is the equation in standard form

Answer 6

standard form is
(x - a)^2 + (y - b)^2 = r^2

where (a,b) is the centre of circle and r = radius

Answer 7

do you want the equation of the circle with centre (-7,-9) and radius 49?

Answer 8

that would be

(x + 7)^2 + (y + 9)^2 = 49^2

Answer 9

to get it in the same form as your equation you need to expand the brackets and rearrange

Answer 10

am i changing the signs bc i got -7,-9

Answer 11

with a radius of 49