Playing with numbers

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Across
  1. 3. | Lines in the same plane that never meet, however far they are extended. |
  2. 4. | The number that is divided in a division operation. |
  3. 6. | Lines that meet at exactly one point. |
  4. 8. The value or set of values that satisfy an equation. |
  5. 9. | The smallest common multiple of two or more numbers. |
Down
  1. 1. Lines that lie exactly on top of each other and have infinitely many common points. |
  2. 2. | A pair of linear equations that has at least one solution. |
  3. 3. | An algebraic expression made up of variables, coefficients, and whole-number exponents. |
  4. 5. | A number that cannot be written as a fraction of two integers. |
  5. 7. | A number greater than 1 that has exactly two factors: 1 and itself. |