How to solve
Use elimination, substitution, or A⁻¹b when det ≠ 0.
Steps
- Eliminate one variable.
- Back-substitute for the other.
Example
x+y=5, x−y=1
- x=3, y=2.
Answer: 3 or 2
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Use elimination, substitution, or A⁻¹b when det ≠ 0.
Steps
Example
x+y=5, x−y=1
Answer: 3 or 2