Exam Maths Puzzle Algebra

Solve by elimination
2x + 3y = 19
5x - 4y = -33

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Exam Other Question

Find the maximum revenue for the revnue function R(x)= 140x - 0.02 x to the second power. The cost for production of a computer and the revenue from sales of x units are given by c = 19x + 165, r = 36. 1x-0. 2 xto the second power. what is the break even points rounding to the