Math Crossword Puzzle

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Across
  1. 3. Two lines meet at a ______
  2. 6. (Upper limit + Lower limit)/2
  3. 8. _____ number of lines can pass through a single point
  4. 9. when x ___ y, (x,y) = (y,x)
  5. 10. Obvious universal truths
Down
  1. 1. Originated from the need for measuring land
  2. 2. Comparisons between Individual items is best shown by
  3. 4. Point where the x axis and y axis meet
  4. 5. -x,-y falls under the _____
  5. 7. ___ of the rectangles in a histogram is proportional to its frequency.