Solve the system algebraically.
check your work. 4x + 2y = 10 3x + 2y = 6
make sure there are no spaces in your answer. be sure to include a comma.

No spaces? like t h i s? or    like    thiiiss???  is      this  bugging    you     

anyway
use elimination
multiply secn equation by -1
-3x-2y=-6

add to other equation
-3x-2y=-6
4x+2y=10 +
1x+0y=4

x=4
sub back to solve for y

3x+2y=6
3(4)+2y=6
12+2y=6
minus 12 both sides
2y=-6
divide 2
y=-3

(4,-3)

X^2 - 4x +(4/2^2) + y^2 + 8y + (8/2^2) = -4 + (4/2^2) + (8/2^2)(x + 2)^2 + (y + 4)^2 = -4 + 4 + 16your center is (-2, -4) and the radius is the sqrt of -4 + 4 + 16 which is 4