exam Maths Puzzle Numerical Ability

6x-2y=2
9x-3y=1

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exam Other Question

I cant figure out how to solve the problem X2 + 9x + 3 = 0.
I was told i need to use the quadratic formula though. Any help would be greatly appreciated. Bridget, Laura and Reagan shared a sum of money. Bridgets share is 40% of the money. Reagans share was $4 more than Lauras. Laurras share was $16. How much money did they share all together?