coordinate geometry

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Across
  1. 3. halfway between two points
  2. 5. length between two points
  3. 7. the name of the vertical axis on the number plane is the ______
  4. 8. the middle of the graph
  5. 9. amount of horizontal change
  6. 10. y=mx+b - this equation is better known as _____
  7. 12. rise over run
  8. 13. where the line intercepts the y axis
  9. 16. the x axis is horizontal,the y axis is ______
  10. 19. where the line intercepts the x axis
  11. 20. a grid that has horizontal and vertical axes is called a ________
  12. 21. the y axis is vertical, the x axis is ______
Down
  1. 1. y-y1= m(x-x1)- this equation is better known as ______
  2. 2. pair of numbers that are a point on a number plane
  3. 4. the four sections of a number plane
  4. 6. the method of substituting into a table of _______ to find coordinates
  5. 10. ax+by+c=0 - this equation is better known as ______
  6. 11. when two line's gradients are the same, they are _____
  7. 14. if x and y are both positive, the points lies in the ____ quadrant
  8. 15. the name of the horizontal axis on the number plane is the ______
  9. 17. amount of vertical change
  10. 18. when one gradient is the negative reciprocal of the other the lines are _____