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Summary

  • An equation is an equality involving one or more unknown quantities known as variables.
  • The general form of linear equations in two variable is ax + by + c = 0.
    • Solution means a pair of values, one for x and other for y; where the values substituted in the given equation makes the two sides of the equation equal.
       
    • A linear equation in two variables has infinitely many solutions.
    • The geometrical representation of ax + by + c = 0 is a straight line.
    •    x= 0 is the equation of the y axis.
    • y= 0 is the equation of the x - axis.
    • In a graph x = k is a straight line parallel to the y – axis.
    • In a graph y = k is a straight line parallel to the x – axis.
    • The type of equation y = mx represents a line passing through the origin.




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