algebra crossword puzzle

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Across
  1. 7. The horizontal number line of a coordinate plane
  2. 8. The difference in the y-values of two points on a line
  3. 9. The point where a graph intersects the x-axis
  4. 10. A measure of steepness of a line, represented by m
  5. 11. A number system that includes the Natural Numbers and zero
  6. 13. operations that undo each other.
  7. 14. a value that makes an equation true.
  8. 15. a mathematical sentence that shows two expressions are equal
Down
  1. 1. A line with slope m and y-intercept b has an equation y=mx+b
  2. 2. The vertical number line of a coordinate plane
  3. 3. One of the four regions into which coordinate axes divides a plane
  4. 4. Put expressions into their most reduced form
  5. 5. allows us to isolate a variable by preforming the same operation on both sides of an equation.
  6. 6. The point where a graph intersects the y-axis
  7. 12. The difference in the x-values of two points on a line