Linear Equations

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Across
  1. 3. a magical school featured in the Harry Potter series
  2. 5. the vertical line in a cartesian plane
  3. 7. a type of equation that forms a straight line when graphed
  4. 9. a popular battle royale game
  5. 12. which NRL team has won the last 4 grand finals?
  6. 13. a horizontal or vertical line in a coordinate plane
Down
  1. 1. the chemical symbol for water
  2. 2. a letter used to represent an unknown number in an equation
  3. 4. the measure of steepness/slope of a line
  4. 6. the point where a line crosses the vertical axis
  5. 8. a diagram showing the relation between two variables using lines or curves
  6. 10. a mathematical statement where two expressions are equal
  7. 11. a marvel superhero also known as Peter Parker