Linear programming, equation and inequality

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Across
  1. 1. The horizontal line on a coordinate plane
  2. 6. Two lines that cross at a right angle are called
  3. 9. A letter that represents an unknown number
  4. 10. The set of points that satisfy all constraints in linear programming
  5. 11. A number that multiplies a variable
  6. 14. A value that does not change in an expression
  7. 15. The vertical line on a coordinate plane
Down
  1. 2. The process of finding the value of an unknown
  2. 3. To draw a function or equation on a coordinate plane
  3. 4. A pair of numbers that shows a point on a graph
  4. 5. A mathematical statement using <, >,
  5. 7. The highest value in a linear programming problem
  6. 8. The lowest value in a linear programming problem
  7. 9. A corner point of a feasible region on a graph
  8. 12. A math sentence with an equal sign
  9. 13. A rule that limits possible solutions in linear programming