find pair order for 9x-9y=-45 9y-9x=45

Question

i need help\

Answer 1

9x - 9y = -45

9y - 9x = 45 multiply this by  -1

9x - 9y = -45

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9x = -45 + 9y

9y = 9x + 45

y = x + 5

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9y - 9x = 45

9y = 9x + 45

y = x + 5

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the lines are the same therefore the order pair is all real number in the domain and range.