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Across
  1. 2. the secondary or vertical axis of a system.
  2. 5. A unit rate means a rate for one of something.
  3. 7. When you define something, that's rate.
  4. 8. something invariable or unchanging.
  5. 9. progressing from one stage to another.
Down
  1. 1. (x,y) of the pt where a line or graph starts
  2. 3. the principal or horizontal axis of a system.
  3. 4. rise over one
  4. 6. a number that is multiplied by a variable.