maths crossword

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Across
  1. 4. an alphabet that can take any value
  2. 6. a pair of equations that has no solution
  3. 8. graph of equations which have infinite solutions
  4. 9. method of solving a pair of linear equations by eliminating one variable
  5. 10. graph of equations which have only one solution
Down
  1. 1. constant quantity placed before and multiplying the variable in an algebraic expression
  2. 2. graph of equations which don't have a solution
  3. 3. method of solving a pair of linear equations by substituting a variable by the other
  4. 5. a pair of equations that has at least one solution
  5. 7. solution of an equation