Two step equations crossword

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Across
  1. 3. a number, a variable, product of two or more variables
  2. 6. finding the value of something
  3. 8. an integer that is written along with a variable
  4. 11. a pair of numbers whose sum is zero
Down
  1. 1. pairs of mathematical manipulations in which one operation undoes the action of the othe
  2. 2. a letter that represents a number
  3. 4. a set of numbers that contain operations and can contain a variable
  4. 5. a system by a set of variables and a set of equations that establish relationships between the variables
  5. 7. a branch of mathematics that uses mathematical statements to describe relationships
  6. 9. a value that doesn't change
  7. 10. a number, a variable, product of two or more variables
  8. 12. any mathematical statement which consists of numbers, variables and an arithmetic operation between them