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Elimination method

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In solving simultaneous equations by elimination, we arrange it so that the coefficients of x in both equations are the same (or the coefficients of y in both equations are the same).

We then subtract the 2 equations to get a new equation in 1 variable, which we can solve.

 

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  1. Elimination method
  2. Substitution method
 

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1. Solve the following simultaneous equation by elimination

12x + 3y = 6
4x - 2y = 8

x = 1,   y = -2
x = 1,   y = 2
x = -1,   y = -2
x = -1,   y = 2

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