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Any equation of the first degree is known as a linear equation.

Linear equation in one variable:
  It is an equation of the form ax + b = o, a ¹ 0 where a and b are constants and x is a variable.

x = - is known as the solution or root of the equation ax + b = 0.

The graph of a linear equation in one variable is a straight line parallel to the x - axis or y - axis.

Examples of linear equation

2x + 1 = 0,    3x - 2 = 0,   x = 7

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