Algebraic Proofs

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Across
  1. 1. if a = b, then b = a
  2. 7. a(b+c) = ab + ac
  3. 8. if a = b and b = c, then a = c
  4. 9. if a = b, then a + c = b + c
Down
  1. 2. for any real number a, a = a
  2. 3. if a = b, then a x c = b x c
  3. 4. if a = b, then a - c = b - c
  4. 5. If a = b, then b can be substituted for a in any equation or expression
  5. 6. if a = b, then a/c = b/c