Simultaneous Equations

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Solve simultaneous equations like:

By substitution

  • x + y = 3, y = 2x + 6
  • 4x + y = -10, y = 2x + 8
  • 3x + 2y = 11, x = 2y + 9
  • 3x − 2y = -7, x = 3y − 14
  • 2x − 3y = 4, y = 3x + 1
  • 3y − 2x = 9, x = 27 − 3y

By elimination

  • x + y = 9, x − y = 5
  • 4x + 3y = 5, 2x + 3y = 7
  • Harder elimination
  • 3x + 4y = -7, x + 2y = -1
  • 5y = 2x + 8, 3y = 4x − 12
  • -3x + 5y − 2 = 0, 5x − 4y − 1 = 0

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