- 4x + 5y Find 6x + 4y R - 4x + 5y = 0, - 4x + 5y = 6, 6x + 4y = 1, 6x + 4y = 8. Round your answer to four decimal places. This can be done directly with a tedious computation, or can be done with a change of variables to transform the parallelogram into a rectangle. Hint: Let u = 4x + 5y and v = 6x + 4y. -dA, where R is the parallelogram enclosed by the lines

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