← Algebra

How to solve

Opposite coefficients (like +2y and −2y) cancel when you add the equations.

Steps

  1. Add the equations to eliminate one variable.
  2. Solve, then substitute back.

Example

x + 2y = 7 and 3x − 2y = 5

  1. Add: 4x = 12 ⇒ x = 3.
  2. y = 2.

Answer: 3 or 2 depending on the prompt

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