Foundations of Can I Do it?

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Across
  1. 3. When lines are same distance apart everywhere
  2. 6. Angles in a triangle add up to this
  3. 7. This doesn't use variables x, y, or z
  4. 8. Protector of Gotham
  5. 10. The ratio of rise over run
  6. 12. The line passing through middle of plotted points
  7. 15. Your favorite math unit this year
  8. 17. When each input has exactly one output
  9. 18. A part of a whole
  10. 20. The x and y 'lines' on a graph
  11. 21. When the solutions are endless
Down
  1. 1. When the graph of a function is a straight line
  2. 2. A flip
  3. 4. Letters that represent an unknown
  4. 5. When you need a close but not exact answer
  5. 6. A number to the zero power
  6. 9. The second decimal place
  7. 10. The type of notation using ten to the power of something
  8. 11. Arguably a hard way to begin the year
  9. 13. Student in class always ready first
  10. 14. Turns a figure around a fixed point
  11. 16. Means same size and shape
  12. 19. The association when y-values tend to increase as x-values increase