Mj math word puzzle

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Across
  1. 3. Difference between the highest and lowest point location on the graph
  2. 4. A place to put points on
  3. 6. one math expression
  4. 7. Greatest common multiple
  5. 9. A-line for coordinates
  6. 11. three math expression
  7. 12. the highest point
Down
  1. 1. less value than zero
  2. 2. two math expressions
  3. 5. greater than zero
  4. 8. an expression that divides another number by itself
  5. 10. Least common multiple