hello : the center is : (a,b) when : a = - 2 and b= 3 an equation y-axis is x= 0 the ridus is the distance betwen the center and y-axis : r = |(1)(-2)+(0)(3)+0 |/√((1)²+(0)²) = 2/1 =2 so : c=4.....( c = r²) an equation of the circle is : (x+2)²+(y-3)² = 4
