Algebra crossword puzzle #2

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Across
  1. 3. a number that can be multiplied by another number to make 1(numerator and denominator are switched)
  2. 7. the answer to an addition problem
  3. 9. a number, a variable, or product of a number and a variable(s)
  4. 10. one of four sections on the coordinate plane formed by the intersection of the x-axis and the y-axis
  5. 11. mathematical sentence that uses equals (=)sign to indicate that the side to the left of the equals sign has the same value as the side to the right of the equals sign
  6. 13. the answer to a subtraction problem
  7. 15. the horizontal number line that, together with the y-axis, establishes the coordinate plane
Down
  1. 1. a mathematical sentence that uses a symbol(<, >, ≤, ≥, ≠) to indicate that the left and right sides of the sentence hold values that are different
  2. 2. an answer that is close to the real answer; to quickly perform an approximation
  3. 4. a number that multiplies a variable
  4. 5. pairs of numbers that have the same absolute value
  5. 6. to replace variables with numbers and then simplify an expression
  6. 7. a set of numbers that follow a pattern
  7. 8. the vertical number line that, together with the x-axis, establishes the coordinate plane
  8. 12. the intersection of the x-axis and the y-axis on the coordinate plane
  9. 14. a term with no variable part (i.e. a number)