Question

帮忙解下,详细点,谢谢!判断下列各对直线是否相交,若相交;求出交点坐标: (1)L1:x-2y=0.L2:2x-y+1=

Answer 1

(1)L1:x-2y=0.L2:2x-y+1=0

相交的.

(x,y)=(-2/3,-1/3)

(2)L1:y=-x+1;L2:x+y+4=0

不相交

(3):L1:-3x=2y L2:y=3/4x-1

相交的

(x,y)=(4/9,-2/3)