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y=2x+3 y=2x﹣3 y﹣3=2x+3 y=3x﹣3
y1>y2>y3 y1<y2<y3 y2<y3<y1 y2>y3>y1
{3,–1} 3,–1 (3,–1) {(3,–1)}
y=2x+3 y=2x-3 y-3=2x+3 y=3x-3
x=3,y=-1 (3,-1) {(3,-1)} {3,-1}
y1>y2>y3 y1<y2<y3 y2<y3<y1 y2>y3>y1
2x+3y﹣8=0 3x﹣2y+1=0 x+2y﹣5=0 3x+2y﹣7=0
y=2x y=-2x+5 y=x2+2x1
y3<y2<y1 y1<y2<y3 y2<y1<y3 y2<y3<y1
①x*x1 ②2*x +3 ①g*g1 ②2*f +3 ①2*g+3 ②f *f 1 ①f *f 1 ②2*g +3