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How do you solve answers for x and y?

2x - 4y = 10
x + 5y = -9

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2x - 4y = 10
x + 5y = -9

x = -9 - 5y

2(-9 - 5y) - 4y = 10

-18 - 10y - 4y = 10

-14y = 28

y = -2

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