Maths thing I didnt finish

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Across
  1. 2. To multiply each term in the bracket by the expression outside the bracket.
  2. 4. A symbol for a value we don't know yet.
  3. 5. How steep a line is.
  4. 6. The reverse process of expanding brackets.
  5. 8. A subject involving variables
  6. 10. Terms whose variables (such as x or y) with any exponents (such as the 2 in x2) are the same.
Down
  1. 1. A plane formed by the intersection of two coordinate axes that are perpendicular to each other.
  2. 3. The rules for simplifying expressions.
  3. 7. A collection of symbols found in almost all maths.
  4. 9. An equation in which the highest power of the variable is always 1.