algebra puzzle

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Across
  1. 4. an area of territory owned or controlled by a ruler or government.
  2. 6. a numerical or constant quantity placed before and multiplying the variable in an algebraic expression
  3. 8. a surface of which one end or side is at a higher level than another; a rising or falling surface.
  4. 9. at right angles to a horizontal plane; in a direction, or having an alignment, such that the top is directly above the bottom
  5. 10. an equation between two variables that gives a straight line when plotted on a graph.
Down
  1. 1. the difference between the highest and lowest values.
  2. 2. the principal or horizontal axis of a system of coordinates, points along which have a value of zero for all other coordinates.
  3. 3. the secondary or vertical axis of a system of coordinates, points along which have a value of zero for all other coordinates.
  4. 5. are values of the variable x such that the values satisfy the equation f(x) = 0.
  5. 7. parallel to the plane of the horizon; at right angles to the vertical.