LINEAR EQUATIONS

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Across
  1. 2. An alphabet that can take any value
  2. 4. A polynomial with degree one
  3. 6. An expression with many terms
  4. 7. An expression same on left and right side
  5. 8. Final value of unknown in an equation
  6. 9. Value is not known
Down
  1. 1. The highest power in a polynomial
  2. 3. Use in real life
  3. 5. An unchanging number