exam Maths Puzzle Numerical Ability

I am trying to figure the equation for 3x+4y=12 (0, ),(5, ), (3/4, ),(0, ), (8/3, )

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the sbc bookstore sold 348 notebooks during the first day of school, some at P 22.50 each and the rest at P 34.20 each. the total amount taken in for the notebooks was taken in for 3+-1/(1/3)