exam Maths Puzzle Numerical Ability

i have to find the center of a circle with an equation (x-2)squared+(y+3)squared=16

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exam Other Question

Write the equation of the line that passes through point (-5, 18) with a slope of -5. Solve the system of equations by graphing. Then classify the system as consistant or inconsistant, dependent or indepenent?
9x-9y=63
9y-9x=-63

Help me please with this one.