1
y=kx+2,4=3k+2,k=2/3
2x-3y+6=0
2
1)x+y+b=0,-3-4+b=0,b=7
x+y+7=0
2)x+3y+b=0,1+3*2+b=0,b=-7
x+3y-7=0
3
L直线斜率K1=1/3,所求直线斜率K2
K1*K2=-1,K2=-3
3x+y+b=0,3*2+0+b=0,b=-6
3x+y-6=0
1
y=kx+2,4=3k+2,k=2/3
2x-3y+6=0
2
1)x+y+b=0,-3-4+b=0,b=7
x+y+7=0
2)x+3y+b=0,1+3*2+b=0,b=-7
x+3y-7=0
3
L直线斜率K1=1/3,所求直线斜率K2
K1*K2=-1,K2=-3
3x+y+b=0,3*2+0+b=0,b=-6
3x+y-6=0