SOLUTION: Find the equation of a circle is tangent to the line -x+y+4=0 at the point (3, -1), and the center is on (1, 1).

Question 1168231: Find the equation of a circle is tangent to the line -x+y+4=0 at the point (3, -1), and the center is on (1, 1).
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!

given:
tangent line : or
the center (,)=(,)
since the distance between the point (, ), and the center (, ) is equal to the radius, we have

the equation of a circle is:

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