Solving methods of system of equations

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Across
  1. 2. Find solutions
  2. 3. pairs
  3. 7. incorrect
  4. 8. unknown
  5. 9. make-sure
  6. 11. more than one
  7. 12. how to
  8. 13. correct
  9. 14. replace
  10. 15. graph
Down
  1. 1. cancel out
  2. 4. express
  3. 5. equal to each other
  4. 6. More than one
  5. 10. line