Algebra terms

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Across
  1. 5. a system where two or more independent equations that are solved together
  2. 6. a function that forma a straight line on a graoh
  3. 11. a number or variable
  4. 12. the letter thingy
  5. 15. a function that compounds
  6. 16. a curve approaching a line that does not intersect it
  7. 17. multiple numbers that look like this x^2+x+2
  8. 18. the number before a variable
Down
  1. 1. the rainbow thingy
  2. 2. an algebraic expression with two terms
  3. 3. terms of the same value like x and x
  4. 4. the number that stays the same
  5. 5. The thing with { } on it
  6. 7. the original equation of a function or the most basic term of a function
  7. 8. the number above the number
  8. 9. how far away something is from zero
  9. 10. the work in algebra
  10. 11. an algebraic expression with three terms
  11. 13. an algebraic expression with one term
  12. 14. F(x)