Algebra Crossword Puzzle

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Across
  1. 5. lines in the same plane that never intersect
  2. 6. The slopes of two lines that are perpendicular
  3. 7. Aset of numbers in a specific order
  4. 8. A comparison of two numbers by division
Down
  1. 1. Any number that can be expressed as a fraction
  2. 2. The simplest form of a linear function, y=x
  3. 3. equations that have the same solution
  4. 4. Whole numbers and their opposites