herandylucas
herandylucas herandylucas
  • 05-02-2014
  • Mathematics
contestada

Substitution how do u do it??

Substitution how do u do it class=

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crisforp
crisforp crisforp
  • 05-02-2014
3x-(2x+7) = -9 <=> x -7 = -9 <=> x = -2; y = 2(-2) + 7 = 3.
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