exam Maths Puzzle Numerical Ability

Find the center and radius by completing the square!
x^2+y^2-4ax-6ay+4a=0

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exam Other Question

One angle of a right triangle measures 75 degrees, what is the measure of the other acute angle? Solve the system of equations by graphing. Then classify the system as consistent or inconsistent and the equations as dependent or independent.

3x-y=6
3x+4y=-9

I am so lost on how do this problem, please help!