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x+y+1=0 x+y-1=0 3x-y-1=0 3x-y+1=0
y3<y2<y1 y1<y2<y3 y2<y1<y3 y2<y3<y1
[-7,26] [-1,20] [4,15] [1,15]
{3,–1} 3,–1 (3,–1) {(3,–1)}
3y-y1=x-x1 y=3kx+b-2 y-y1=k(x-x1) y=ax -4
x+3y-8=0 x-3y+8=0 x-3y+9=0 3x-y-4=0
x=3,y=-1 (3,-1) {(3,-1)} {3,-1}
π 2π
y-y 1=k(x-x 1) y=5kx+3 y =9k(x-x 1) y=4x+b