Maths...

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Across
  1. 5. _Substitution
  2. 6. Determinants
  3. 7. Cramers Rule
  4. 8. _Rationalize
  5. 9. _Linear Equasions
Down
  1. 1. Elimination
  2. 2. Matrix
  3. 3. _Inequalities
  4. 4. Absolue Value