book Maths Puzzle Numerical Ability

Please help me answer the question: Find the center of the circle with the equation {{{x^2+y^2-4x+6y+1=0}}}

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book Other Question
1. Use Cramer's Rule to solve for z.

3x+2y-z=17
2x+3y-z=15
2x-3y-z=-3

2. Solve the system:
2x+y+3z=-5
y+z=3
4x+3y+7z=3

3.Find the values of A and B in the following please help me {x-2}<1 need to graph it