book Maths Puzzle Numerical Ability

HOW DO I FIND THE EQUATION OF A CIRCLE WHERE THE CENTER IS (-3, 4) AND A POINT ON THE EDGE IS (4, 6).

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book Other Question
Is it possible for two lines with positive slopes to be perpendicular? explain. Solve the equation:
-4/4z - 16 then -3 = -3/z-4
Solve for z