Algebra puzzle

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Across
  1. 3. a numbers value |x|
  2. 6. to get a solution to an equation
  3. 11. involving the second and no higher power of an unknown quantity or variable.
  4. 13. the points where the line crosses the x axis
  5. 14. raise a number to the tenth power
  6. 15. a line is:
Down
  1. 1. to change an equation into a simpler form
  2. 2. curve in which every point on the curve is equidistant
  3. 4. the highest point on a parabola
  4. 5. the power to which a given number or expression is to be raised
  5. 7. A grouping of terms or values that use a sign to show that they are equal
  6. 8. the point where the line crosses the y axis
  7. 9. the x or y values are:
  8. 10. a number that when multiplied with another produces a number or expression.
  9. 12. a value or number that remains the same