algebra

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Across
  1. 1. Graph of the quadratic polynomial is ------
  2. 4. parallel lines ---- cut each other.
  3. 5. if b^2-4ac =0 the the both roots are --- and equal
  4. 6. Maximum numbers of zeros in quadratic equation are ----.
Down
  1. 2. ax+by+c = 0 is a ---- equation in two variables.
  2. 3. ----- lines indicates only one solution.