Question

help please

Answer 1

okay so you have the centre
(-1,-2)
the standard equation is
(x-x1)²+(y-y1)²=r²

x1 is the x coordinate
y1 is y coordinate
r is the radius

(x+1)²+(y+2)²=r²

draw a diagram to figure out the radius


radius is 1 i think

so sub in r=1

(x+1)²+(y+2)²=1

Answer 2

http://www.examsolutions.net/maths-revision/core-maths/coordinate-geometry/circle/equation/tutorial-1.php this will help you