7th Advanced Crossword Puzzle

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Across
  1. 3. two or more equations graphed together
  2. 6. the final answer to a system of equations
  3. 9. to replace or instead of
  4. 10. drawing a line on a coordinate plane
  5. 12. (random) a breakfast food with squares like a grid
  6. 13. a type of term with no variable
  7. 15. fancy term for 'doing the opposite'
Down
  1. 1. a positive or negative whole number, including 0
  2. 2. a number multiplied by a variable
  3. 4. where equations are graphed
  4. 5. when two lines don't cross
  5. 7. multiply by a number outside the parentheses
  6. 8. to get something by itself
  7. 11. describes where two lines cross
  8. 14. the # of solutions to lines that are the same