exam Maths Puzzle Numerical Ability

Hello
with the substitution how do i solve:

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

thank you

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exam Other Question

Emilio and Rose sell half of their book collection at a garage sale. They donate 1/5 of the remaining books to a resale shop and keep 40 books. How many books did they have to start with? log(x-1)+log(x+1)=2