Solve the system, use Substitution: x + y = 11, y = x + 5 * 4 points
(-2 , 3)
(3 , 8)
(7 , 4)
(6 , 5)

Use the Substitution method to solve this system of equations:

.

x=-y-1

x-y=-11

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Substitute -y-1 for x in the second equation. (We can make this move because the first equation tells us that whatever x is, it is equal to -y-1.)

.

x-y=-11

%28-y-1%29-y=-11

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Simplify by combining like terms.

-2y-1=-11

-2y=-10

y=5

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Substitute 5 for y in the first equation.

x=-y-1

x=-%285%29-1

point a is the center of the circle that passes through points e, f, and g and the center of the circle that passes through points x, y, and z.