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What is the x-coordinate of the solution for the system of equations?

{y−x=9
{10+2x=−2

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x =

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MissPhiladelphia

Y – x = 9

10y + 2x = -2

 

Using the first equation

Y = 9 + x

Substitute to the 2nd equation

10( 9 + x ) + 2x = -2

90 + 10x + 2x = -2

12x = -92

X = -23 / 3

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