To find the center of the circle, set the x-component equal to zero and the y-component equal to zero to find the ordered pair.
x+1=0 x=-1
y+2=0 y=-2
The center of your circle will be at (-1, -2).
To find the radius of the circle, square root the 16.
The equation of a circle is x^2+y^2=r^2
So square root the 16 to get your radius, which is 4.
To graph the circle, plot the center of the circle, and plot 4 different points directly out from the center that are 4 units out. Then connect the dots :)
