exam Maths Puzzle Numerical Ability

I would like to know four names of linear equations and the general form and if you could please indicate the meanings of each of the constants and please provide an advantage of u

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Lucy has some money invested at 18% annual interest and three as much invested at 12%. Her total annual income from two investments is 2200pesos. How much was invested at each rate Mary Poppins invests a total of $13,500 in two savings accounts. One pays 2% annual interest and the other pays 3% annual interest. If her total annual interest is $352.70, how much did she invest in each account?