Linear equations

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Across
  1. 1. when linear equations have no solution
  2. 6. intersecting and coincident lines are
  3. 7. system of equation having a unique solution.
Down
  1. 2. an equation of form ax+by+c=0 is called
  2. 3. a combination of constants and variables connected by arithmetrical operations is called _______ expression
  3. 4. 3x+2y=6 and 9x+6y=18 has __________ many solutions
  4. 5. the graph of linear equation in two variables is a