Slope -1/4, passes through (12,-4)​

y = - x - 1

Step-by-step explanation:

Assuming you require the equation of the line

The equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

Here m = - , then

y = - x + c ← is the partial equation

To find c substitute (12, - 4) into the partial equation

- 4 = - 3 + c ⇒ c = - 4 + 3 = - 1

y = - x - 1 ← equation of line

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.