Page 56 - E booklet prep 3 bader 2025 b_Neat
P. 56
3- The slope of the straight
line
We can find the slope of the straight line by four ways
1) from any two points ( ???? , ????) ?????? (???? , ????) on it by using the rule
?? = ????-????
???? - ????
2) By using the positive measure of the angle ?? that the line makes with
positive direction of the x – axis
?? = ????????
3) From the equation of the straight line in the form
???? + ???? + ?? = ??
? the slope of the straight line = -?? = -?????????????????????? ???? ??
?? ?????????????????????? ??????
4) If the equation of the straight line in the form :
?? = ???? + ?? , then the slope = m
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