exam Maths Puzzle Numerical Ability

A recent poll conducted by The New York Times and CBS News, published on
September 10, 2007 asked respondents
² If you had to choose, whom would you say you trust the most with

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exam Other Question

Can you please help me solve using the elimination method?

8x - 5y = 8
2x + 3y = 2
5y3-y2+15y-3=0

Im so confused could someone please help me?