exam Maths Puzzle Numerical Ability

Solve the following system of linear equations using the elimination (addition) method.

5x-2y=4
3x+3y=-6 Stimultaneous Solution = (__,__)

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exam Other Question

how can one determine if a word problem can be solved using the Quadratic Equation and why one can determine that?
Thank you so much!!
What is the solution? 5x+12=3x-6