Linear equation

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Across
  1. 4. 2x+3y-9=0;4x+6y-18=0
  2. 5. COINCIDENT LINES
  3. 6. COINCIDENT LINES
  4. 7. CONSISTENT;INCONSISTENT
Down
  1. 1. NO SOLUTION
  2. 2. UNIQUE SOLUTION
  3. 3. SUBSTITUTION;ELIMINATION
  4. 8. PARALLEL LINES