Question

已知y1=ax1+b,y2=ax2+b,则图像过点P(x1,y1)Q(x2,y2)

Answer 1

Y=AX+B

P(X1,AX1+B) Q(X2,AX2+B)

设过PQ为Y=KX+C

将P,Q坐标代入得

AX1+B=KX1+C

AX2+B=KX2+C

K=A C=B

即Y=AX+B