Algebra Puzzle

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Across
  1. 5. The letter after the number
  2. 7. An algebraic expression consisting of coefficients and variables.
  3. 9. The thing in front of the variable
  4. 11. A open curved line on a graph
  5. 13. The point where the line or curve crosses the axis of the graph.
  6. 15. A relation between a set of inputs having one output each.
Down
  1. 1. Two expressions separated by an equal sign
  2. 2. Replacing the variables in an algebraic expression,equation,or inequality.
  3. 3. Measurements of how steep the line is.
  4. 4. All the input values on the x-axis
  5. 6. Both sides are not equal
  6. 8. The method of expressing large numbers in terms of powers.
  7. 10. Single numbers, variables,or the product of a number and variables.
  8. 12. Whole numbers that can be positive or negative.
  9. 14. The number of times a number is used as a factor in multiplication problem