3x-y-7=0 (1)
2x+3y-1=0 (2)
y-kx+9=0 (3)
(1)*3+(2),得(3x-y-7)*3+2x+3y-1=6x-3y-21+2x+3y-1=8x-22=0
解得x=11/4
代入(1),解得y=5/4
将x、y代入(3),解得k=41/11
3x-y-7=0 (1)
2x+3y-1=0 (2)
y-kx+9=0 (3)
(1)*3+(2),得(3x-y-7)*3+2x+3y-1=6x-3y-21+2x+3y-1=8x-22=0
解得x=11/4
代入(1),解得y=5/4
将x、y代入(3),解得k=41/11