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x = number of braceletsy = number of necklaces Write system of equations x + y = 120 8x + 11y = 1140 Solve using

x = number of braceletsy = number of necklaces

Write system of equations

x + y = 120

8x + 11y = 1140

Solve using addition method (1st multiply top equation by negative 8)

-8x - 8y = -960

8x + 11y = 1140

how did they get -8 x -8y and 960

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