again... The sum of two numbers is -20 and the difference of the numbers is 2. What are the two numbers?

-11 and -9

Step-by-step explanation:

-11+-9 is -20

Step-by-step explanation:

Sum means adding. And difference means subtracting. Let x be one of the numbers and y can be the other one. Add them

x + y = -20 And make the other equation by subtracting them

x - y = 2 You can solve this by lining up these two equations one on top of the other, and adding the whole entire equations together.

x + y = -20

x - y = 2 this will get rid of the y. You get 2x = -18. Divide both sides by 2 and get x = -9. Then use either one of the original equations to find the other number, y. So let's use the addition equation: x + y = -20, fill in the -9 for the x and get -9+y= -20 Then add 9 to both sides to get y=-11

So the numbers are -9 and -11

center (1,3) with radius 6

step-by-step explanation:

we must complete the square to find the center and radius of the circle.

first make sure the x and y squared terms have 1 as their coefficients. we also make sure x and y terms together.

we now create space between the x and y terms with parenthesis.

we complete the square by taking the middle terms -2x and the -6y - divide each and square them.

we add the squares to both sides.

simplify.

and write the quadratics in factored form.

the center is (h,k) or (1,3). the radius is the square root of 36 which is 6.