anonymous
  • anonymous
Solve the following pair of equations for x and y : 3x+2y=9xy ; 9x+4y=21xy ; x, y ≠ 0.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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hartnn
  • hartnn
do you know the method of elimination ?
hartnn
  • hartnn
multiply 1st equation by 3 and subtract it from 2nd equation, what do u get ?
anonymous
  • anonymous
yup elimination method...

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More answers

anonymous
  • anonymous
10y = 48 xy?
hartnn
  • hartnn
did you add, instead of subtracting ? :P
anonymous
  • anonymous
subtract
anonymous
  • anonymous
cut the 9's
hartnn
  • hartnn
9x+6y=27xy subtract from 9x+4y=21xy so, whats 6y-4y =... ?
anonymous
  • anonymous
i thnk we shud multiply by -3 and add
anonymous
  • anonymous
2y
hartnn
  • hartnn
multiply by +3 and subtract is exactly equivalent to multiply by -3 and add do what you are comfortable with :)
hartnn
  • hartnn
you should get 2y=6xy in the end, ask me if you don't get that
anonymous
  • anonymous
yup...............finally gt it..................thnx man!!
hartnn
  • hartnn
welcome ^_^

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