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10 July, 16:08

Solve the system

{3x-y=4

-9x+3y=-12

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Answers (1)
  1. 10 July, 16:10
    0
    Hello:

    3x-y=4 ... (1)

    -9x+3y=-12 ... (2)

    by (1) : y = 3x-4

    in (1) : - 9x + 3 (3x-4) = - 12

    -12=-12

    infinity solution : (x, 3x-4) x in R
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