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Choosing a method and checking

Choosing a method and checking

Secondary 2

For each pair of simultaneous equations, choose the substitution method or the elimination method and give a reason for your choice. Then solve the equations and check your answer in both equations.

  1. \(y=2x-7\) and \(3x+2y=7\)
  2. \(5x+3y=11\) and \(2x-3y=17\)

Solution:

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Answer:(a) substitution; \(x=3,\ y=-1\) (b) elimination; \(x=4,\ y=-3\)

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