Algebric crossword puzzle

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Across
  1. 1. set of two or more inequalities involving the same variables
  2. 3. a straight line is used to find the equation of a line.
  3. 4. mathematical expression consisting of two main parts, variables and constants
  4. 7. When you multiply or divide by a negative, you must reverse the direction of the inequality
  5. 8. the set of all the solutions of an equation or condition.
  6. 10. a symbolic expression of the fact that two quantities are not equal.
  7. 12. point where the graph crosses the y-axis
  8. 13. most common way of representing a mathematical element
  9. 14. operation that undoes what was done by the previous operation
Down
  1. 1. change in y coordinate with respect to the change in x coordinate of that line
  2. 2. expressions where any two values are compared by the inequality symbols
  3. 5. two or more algebraic equations that are solved together.
  4. 6. a line that separates the regions of solutions for a system of linear inequalities in two variables.
  5. 9. a statement that the values of two mathematical expressions are equal
  6. 11. coordinate plotted on the x-axis for any given curve