anonymous
  • anonymous
2x+3y=3 x-12y=-9 solve for x and y
Mathematics
schrodinger
  • schrodinger
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jwt625
  • jwt625
it's wrong
jwt625
  • jwt625
x=1/3,y=7/9
jwt625
  • jwt625
the answer should be x=1/3,y=7/9

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anonymous
  • anonymous
the mistake was leaving a -9 instead of a 3 in the substitution of the first equation...
anonymous
  • anonymous
2x+3y=3 x-12y=-9 make x the subject in the 2nd eqn x=12y-9 put it into the first eqn 2(12y-9)+3y=-9 24y-18+3y=-9 27y-18=-9 27y=-27 y=-1 put y=-1 into 2x+3y=3 2x-3=3 2x=6 x=3 x=3, y=-1

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