求下列直线的斜率、倾斜角及在y轴上截距 1.2x+y+3=0 2.x5-y4=0 3.x-2y=0 4.x=y
问题描述:
求下列直线的斜率、倾斜角及在y轴上截距 1.2x+y+3=0 2.x5-y4=0 3.x-2y=0 4.x=y
答
1、y=-2x-3
斜率k=-2
倾斜角=arctan(-2)=-63.4°
y轴上截距
2、y=1.25x
k=1.25
a=arctan1.25=51.34°
截距=0
3、y=x/2
k=1/2
a=arctan1/2=26.57°
截距=0
4、y=x
k=1
a=arctan1=45°
截距=0