ALGEBRA

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Across
  1. 4. To solve an algebraic expression by substitution
  2. 5. A symbol or number which stands alone
  3. 7. Two or more terms separated by an operation
  4. 9. A polynomial with three unlike terms
  5. 10. A symbol or letter
Down
  1. 1. Two expressions joined by an equal sign
  2. 2. An expression consisting of two terms
  3. 3. To replace a variable with a number
  4. 5. The numerical part of a term, usually written before the variable
  5. 6. An expression which consists of only one term
  6. 8. Sum and/or difference of terms
  7. 9. A part of an algebraic expression