book Maths Puzzle Numerical Ability

Solve the system for y:
6x-y = -3
6x-2y = 2

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book Other Question

Milk that has 5% butterfat is mixed with milk that has 2% butterfat. How much of each is needed to obtain 60 gallons of milk that has 3% butterfat? I am horrible at understanding Simplify by rationalizing the denominator:
(/11-/5)
________
(/11+5)