英文直線的斜率數學題(20分)

1. The slope of the line passing G & H

= (-1.3 - 3.2) / (2.6 - 1.7)
= - 4.5 / 0.9
= - 5


2. The slope of the line passing N & P

= (a - b) / (b - a)
= [- (b - a)] / (b - a)
= -1

In each of Nos.1-2,find the slope of a line L which passes the given pair of points.
1. G(1.7,3.2),H(2.6,-1,3)
2. N(a,b),P(b,a)where a =/=(不等於) b
sol
1. (3.2-1.3)/(1.7-2.6)=(32-13)/(17-26)=19/-9=-19/9
2. (a-b)/(b-a)=-1