exam Maths Puzzle Numerical Ability

I am learning conics but am not sure how to handle coefficients in the problem, here is an example, can someone help me get started?

3x^2 + 3y^2 - 6x + 5y = 0 (should be a circ

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exam Other Question
solve for x and y using three different methods, substitution, addition and graphing x-y=12
2x+y=3



Substitution

x=y+12
2(y+12)+y=3
2y+24+y=3
3y=3
y=1 Calculate the area contained between the curves
y = x3+7, y = 8 and x = 0