Coordinate plane and linear equations

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Across
  1. 2. Any real number that cannot be written in fraction form
  2. 4. add repeatedly
  3. 7. a statement that the values of two mathematical expressions are equal (indicated by the sign =).
  4. 10. is a polynomial with two terms
  5. 12. the opposite of addition
  6. 13. is how many times (a number) contains another.
  7. 14. Any number that can be written as a ratio (or fraction) of two integers
  8. 16. is an expression consisting of variables and coefficients
  9. 18. a quantity which during a calculation is assumed to vary or be capable of varying in value.
Down
  1. 1. a number multiplied by a variable.
  2. 3. the opposite of subtraction
  3. 5. have parenthesis, exponents, multiplication, division, addition, subtraction
  4. 6. is part of the coordinate plane in horizontal
  5. 8. is a flat, two-dimensional surface that prolongs infinitely far.
  6. 9. Part of mathematics that deals with quantity in general, representing it by means of letters or other signs
  7. 11. is an expression of the form k⋅xⁿ, where k is a real number and n is a positive integer.
  8. 15. a value used to represent quantity.
  9. 17. is part of the coordinate plane in vertical