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11 June, 22:55

What is 10x-10y=0 - 20x-5y=-25

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  1. 11 June, 23:56
    0
    -10x-15 - (-25)

    -5 (2x+3-5)

    -5 (2x-2)

    -5*2 (x-1)

    = - 10 (x-1)
  2. 12 June, 01:33
    0
    Solve for the first variable in one of the equation, then substitute the results into the other equation (1,1)
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