Question

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Answer 1

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Answer 2

Step-by-step explanation:

$2x + 3y = 10(1) \times 2\\ 3x + 2y = 15(2) \times 3 \\ \\ 4x + 6y = 20 \\ 9x + 6y = 45 \\ - - - - - - - - - \\ - 5x = - 25 \\ x = 5 \\ - - - - - - - - - \\ 2 \times 5 + 3y = 10 \\ 10 + 3y = 10 \\ 3y = 10 - 10 \\ 3y = 0 \\ y = 0 \\ \\ x = 5 \\ y = 0 \\... x + y \\ = 5 + 0 \\ = 5$

subtract 2nd equation from 1st equation ,the symbols will change

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