anonymous
  • anonymous
Using elimination, substitution solve A A. 3x - 9y = 3 6x - 3y = (-24)
Biology
  • Stacey Warren - Expert brainly.com
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schrodinger
  • schrodinger
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anonymous
  • anonymous
@hereweg0
anonymous
  • anonymous
it belongs in the math section
anonymous
  • anonymous
but okay. 3x - 9y = 3 lets get x alone. 3x=3+9y

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anonymous
  • anonymous
yeah i dont care
kasim17
  • kasim17
1)Elimination by coefficient method 3x - 9y = 3 .....( i ) 6x - 3y = - 24 ...( ii ) Multiplying ( i ) by 2,we get 6x - 18y = 6 .... ( iii ) Subtracting ( ii ) from ( iii ),we get 6x - 18y = 6 6x - 3y = - 24 (-) (+) (+) --------------------- - 15y = 30 y = - 2 Substituting y = - 2 in ( ii ),we get 6x - 3(- 2) = - 24 6x + 6 = - 24 6x = - 30 x = - 5 x = - 5 and y = - 2 is the solution of given simultaneous equations. 2)Substitution method 3x - 9y = 3 Dividing throughout by 3,we get x - 3y = 1 x = 1 + 3y ..... ( i ) 6x - 3y = - 24 .....( ii ) Substituting ( i ) in ( ii ),we get 6(1 + 3y) - 3y = - 24 6 + 18y - 3y = - 24 15y = - 30 y = - 2 Substituting y = - 2 in ( i ),we get x = 1 + 3y x = 1 + 3(- 2) x = 1 - 6 x = - 5 x = - 5 and y = - 2 is the solution of given simultaneous equations. According to me both the methods are efficient and easy. It varies from individual to individual to decide which method is efficient. So my opinion to you is that learn both the methods and practice hard and try to master them. !!!HOPE I HELPED!!!!
anonymous
  • anonymous
belong in math
anonymous
  • anonymous
hmm nice haha
anonymous
  • anonymous
this is science....
anonymous
  • anonymous
Thanks kasim17

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