Math stuff

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Across
  1. 6. Values go down as x increases
  2. 8. Displays data as individual dots on a coordinate plane
  3. 9. Average of a set of numbers
  4. 10. Middle value in an ordered data set
  5. 11. Replacing a variable with a known value
  6. 13. Creates a mirror image
  7. 15. Values go up as x increases
Down
  1. 1. The highest value of a function
  2. 2. The lowest value of a function
  3. 3. Plotting points on a coordinate plane
  4. 4. Does not form a straight line on a graph
  5. 5. Difference between the highest and lowest values
  6. 7. Method of solving systems by removing a variable
  7. 12. Most frequently occurring value in a data set
  8. 14. Forms a straight line on a graph