anonymous
  • anonymous
Solve using addition method. 2x-y=7 x+2y=1
Mathematics
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
Multiply the first eqn by 2 throughout and add the two eqn to eliminate the y term
anonymous
  • anonymous
2x-y=7 therefore 4x-2y=14....(1) x+2y=1.....(2) add 1 and 2 you will get 5x=15 as 2y will be canceled out. so x=3. putting x in eqn 2 you will get 2y=-4=> y=-2.
anonymous
  • anonymous
4x -2y = 7 x + 2y = 1 Adding both 5x = 8 So x = 8/5

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anonymous
  • anonymous
Sorry, it is 4x -2y = 14 x + 2y = 1 Adding both 5x = 15 So x = 15/5 ie 3
anonymous
  • anonymous
Then as dipankar has done

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