Equation of a Straight Line

Things to remember

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1. If the straight line passes through the origin then y - intercept of c = 0. In this case, an equation of the straight line is y = mx.
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2. The tangent of the angle made by the straight line on the positive X-axis is called slope of the straight line. 
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3. When the angle is made in a straight line with x-axis making positive direction is said to be the inclination of a line. It is devoted by θ.
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4. If three or more than three points lies in same straight line then it is said to be collinear points.
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