exam Maths Puzzle Numerical Ability

Solve graphically:
5x-2y=3
2x-y=0

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2. What three techniques can be used to solve a quadratic equation? Demonstrate these techniques on the equation "12x2 - 10x - 42 = 0".
you have a mayor that 55%of the people would vote for and he lose 2% a month and the chalanger is support by 30% of the people and he gains 3% a month in what month would they be equal