设横纵截距风别为a,b
则X/a+y/b=1
且 -b/a=1/4
|ab|=4
∵K＞0
∴ab＜0
∴-ab=4
∴解得a=4 b=-1
或a=-4 b=1
∴y=1/4X-1
或y=1/4X+1