System of Equations and inequalities

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Across
  1. 4. a missing value in an equation
  2. 6. a four quadrant plane where points are plotted
  3. 10. using something else in place of a variable
  4. 11. getting rid of a variable in an system of equations
Down
  1. 1. an equation where the highest power of the variable is one
  2. 2. becoming a lower amount
  3. 3. becoming a greater amount
  4. 5. the value(s) that replace a variable that makes an equation true
  5. 7. expression that shows that two mathematical values are equal
  6. 8. in relating to two values not being equal
  7. 9. number being multiplied by a variable