Question

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

Answer 1

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