book Maths Puzzle Numerical Ability

please tell me how this goes 2x-y=1
3x+4y=3xy thank you

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2/3x-1/6=1/2x+5/6 wILLLIE INVESTS SOME MONET AT 7.5%. hE ALSO INVESTS $4,000 LESS THAN THIS AMOUNT AT 6.5%. hIS TOTAL ANNUNAL INCOME FROM THE INTEREST OF THESE TWO INVESTMENT IS $1,000. hOW MUCH MON