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y-y1=k(x-x1) y=5kx+3 y =9k(x-x1) y=4x+b
X1=0,X2=600,Y1=0,Y2=700 Y1=0,Y2=600,X1=0,X2=700 X1=0,X2=0,Y1=600,Y2=700 Y1=0,Y2=0,X1=600,X2=700
3y-y1=x-x1 y=3kx+b-2 y-y1=k(x-x1) y=ax -4
y-y1=k(x-x 1) y=5k x+3 y=9k(x-x 1) y=4x+ b
y-y1=k(x-x1) y=5kx+3 y=9k(x-x1) y=4x+b
x≠0且y≠0 x≠0或y≠0 x,y至少一个不为0 不都是0
y1>y2>0 y1<y2<0 y1>0>y2 y1<0<y2
y-y1=k(x-x 1) y=kx+8 y=4kx y=ax+b
xy<0 xy>0 x>0,y>0 x<0,y>0
public x x1=new y(); x x1:x(); x x1=new x(); int x x1;