exam Maths Puzzle Numerical Ability

3x+2y=51

13=20x-5y

3y=-4x+2

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exam Other Question

Can somebody please help me?

2. What three techniques can be used to solve a quadratic equation? Demonstrate these techniques on the equation "12x2 - 10x - 42 = 0".
Can you help me solve this?

4/5x +9 = -2