The circle is in A, so (-1, 4) coords
(x - xo)² + (y - yo)² = r²
(x - (-1))² + (y - 4)² = r²
(x + 1)² + (y - 4)² = r²
And the radius is the length of segment AC
distance of AC is
So r = 5
(x + 1)² + (y - 4)² = 5²
(x + 1)² + (y - 4)² = 25
Is y – 2 = –5(x – 2) a linear function
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