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X1 X2 (X1,X2) (X1,X2,X3,X4)
y-y1=k(x-x1) y=5kx+3 y =9k(x-x1) y=4x+b
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X1 X2 (X1,X2) (X1,X2,X3,X4)
y-y1=k(x-x1) y=5kx+3 y=9k(x-x1) y=4x+b
X1 X2 (X1,X2) (X1,X2,X3,X4)
y3<y2<y1 y1<y2<y3 y2<y1<y3 y2<y3<y1
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Ix1<Iy1,Ix1<Ix2 Ix1=Ix2,Ix2<Ix3 Ix2<Ix3,Iy1=Iy2 Ix2=Ix3,Iy2<Iy3