Algebra

  
Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
1. An is an equality, which is true for all values of the variables in the equality.

2. An is true only for certain values of its variables.

3. Subtraction of a number is the same as addition of its inverse.

4. x + y – 5 is an .

5. x + y = 5 is an .