Algebra vocabluary

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Across
  1. 3. replace the letter with a number
  2. 5. terms that have the same value
  3. 8. A letter that stands for a number.
  4. 9. a number that does not change
Down
  1. 1. the number in front of the variable
  2. 2. A mix of numbers, variables, and operations (no equals sign)
  3. 4. make the expression shorter or easier
  4. 6. a math sentence showing two things are equal (has an equals sign)
  5. 7. a part of an expression separated by a + or -