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6 January, 14:34

Y=x

y=2x+9

how do I do it

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Answers (1)
  1. 6 January, 14:56
    0
    Substitute for y in the second equation so x=2x + 9, then subtract x from both sides so that 0=x+9, then subtract 9 from both sides and you get x = - 9
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