book Maths Puzzle Numerical Ability

elimination method

3x+2y=-24; 4x+3y=18

5x-4y=-114; 2x+6y=-57

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book Other Question

one thousand dollars in a savings account pays 7% interest per year. The interest earned after the first year is added to the account. How much interest is earned on the new principle the following year?

Thanks you very much 5+7z=7z+5