exam Maths Puzzle Numerical Ability

3x-y=1
2x-3y=10

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exam Other Question

ok i am in Algebra A and i am doing weighted averages. the problem is: An alloy of metals is 25% copper.Another alloy is 50% copper. how much of each alloy should be used to make 1000 grams of an alloy that is 45% copper? How do I simplify this radical expression.

-3 Square root of 20 times square root of 15.

Also this one.

-2 square root of 6a cubed times square root of 3a.

Thanks