*Slope of a straight line
- Slope (symbol, m) of a straight line is defined as the tan of the anticlock wise angle made by that line with the positive horizontal axis.
- i.e. m = tan θ
- As tan θ can have any real value, so we can say
- Slope of a straight line passing through points A (x1, y1) & B (x2, y2) is given by
- Here Δx, Δy represents change in x & y coordinates respectively.
- If two lines are ||, then their slopes are equal.
- If two lines are perpendicular then the product of their slope is – 1.