求满足下列各条件的直线方程 (1)直线过点(3,2),(4,1) (2)直线过点(2,-2),倾斜角α=30°
问题描述:
求满足下列各条件的直线方程 (1)直线过点(3,2),(4,1) (2)直线过点(2,-2),倾斜角α=30°
答
(1)两点式.(y-2)/(1-2)=(x-3)/(4-3)
x+y-5=0,y=5-x
(2)tanα=√3/3
点斜式,y+2=√3/3(x-2)
y=√3/3x-2√3/3-2