Since 7x – y = 23 and 7y – x = 31
Adding these 2 equations we get 6x + 6y = 54
Dividing this equation by 6,
we get x+y = 9(Option E)
Adding these 2 equations we get 6x + 6y = 54
Dividing this equation by 6,
we get x+y = 9(Option E)
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