Linear equations crossword puzzle

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Across
  1. 7. solve
  2. 9. constant
  3. 12. line
  4. 13. add
  5. 14. x
  6. 15. answer
  7. 16. Coefficient
  8. 17. equation
  9. 18. =
Down
  1. 1. out Solve
  2. 2. Equation
  3. 3. axes
  4. 4. solve
  5. 5. slope
  6. 6. equal
  7. 8. same
  8. 10. variables
  9. 11. formula