Math Puzzle

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Across
  1. 2. One or more linear equations taken as one
  2. 6. Expression with Radical sign
  3. 9. Even Exponent
  4. 11. negative radicand and even index
  5. 13. exponents Can be converted to radicals
Down
  1. 1. Answer to the system
  2. 2. Same index and radicand
  3. 3. house
  4. 4. Alternative to substitution
  5. 5. 2 lines that meet
  6. 7. root Positive root
  7. 8. If odd exponent
  8. 10. square Has 2 real roots
  9. 12. Get this when lowering index