algebra

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Across
  1. 4. when you add to or more numbers
  2. 5. the circumference of a circle
  3. 6. half of diameter
  4. 7. when number is multiplied by its self multiple times
  5. 8. when you subtract or more numbers
  6. 9. when you use slope and points to solve the equation
Down
  1. 1. when you replace x or y for what it equals
  2. 2. middle line of a circle
  3. 3. when you remove to of the same number to solve the equation
  4. 8. the way you use to plot a line,(hint: m=)