Answer :

Answer: x = -9

Step-by-step explanation:

-10x - 10y = -10

when y = 10

-10x - 10(10) = -10

-10x - 100 = -10

Add 100 to each side

-10x = 90

Divide each side by -10

x = -9

-10(-9) - 10(10)

90 - 100 = -10

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