exam Maths Puzzle Numerical Ability

how do you solve using elimination and substitution..i have 29 problems to answer so this helps me umm here is the problem 2x-7y=8 and 3x-4y=-1

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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 The ideal diameter of a steel reienforcement rod is 2.8 cm the actual diameter may vary from the ideal by at most 0.06 cm.Find the range of acceptable diameters for the rod.