systems of equations

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Across
  1. 1. not the same
  2. 3. side by side and never touch
  3. 4. a straight set of points
  4. 8. the point which the lines intersect
  5. 9. replacing something with another
  6. 10. a large number
  7. 11. the point when two lines cross
  8. 13. no difference
Down
  1. 2. math statement that shows equality
  2. 5. value to represent quantities
  3. 6. when the line crosses the y-axis
  4. 7. no limits
  5. 8. measure of steepness
  6. 9. a set of equations
  7. 12. a diagram with points and lines