Mathematical Crossword!

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Across
  1. 4. Lines that have an undefined slope
  2. 5. Also known as fractions; numbers between integers
  3. 8. Numbers that cannot be expressed as a ratio of two integers
  4. 9. A set of points in a plane, each of which is equidistant from a fixed point called a center
  5. 10. Numbers that make up other numbers
  6. 12. Numbers that are positive integers; counting numbers
  7. 14. Lines that have a slope of zero
  8. 15. The part of the quadratic equation that is under the radical sign; it can help you determine if a number is a perfect square
  9. 17. A property that is accepted without proof and is used as a starting point when working with numbers
  10. 18. Numbers with points on the number line
Down
  1. 1. Function This kind of function can have one, two, or three X-intercepts
  2. 2. The vertical distance between two points divided by the horizontal distance between two points
  3. 3. Equation An equation that has a variable in the denominator
  4. 6. Numbers that can't be expressed, even with a root
  5. 7. Numbers that can be expressed exactly as a ratio of two integers
  6. 11. Step Squaring both sides when solving an irrational function is known by this name
  7. 13. A set of values of the dependent variable corresponding to all the values of the independent variable in the domain
  8. 15. A set of values of the independent variable
  9. 16. A whole number and its opposite