1.直线Y=MX+N与Y=2X+1相交于(2,B),与Y=-X+2相交于(A,1)求M,N值
与Y=2X+1相交于(2,B),代入,B=2*2+1=5,B=5,
与Y=-X+2相交于(A,1)带入,1=-A+2,A=1,
就是直线Y=MX+N 经过 (2,5) ,(1,1)
5=M*2+N,
1=M*1+N
5-1=2M+N-1M-N,
4=M
1=4+N,N=-3,
2.当K为何值时,函数Y=2-X,Y=-X/3+4,Y=4/K X-3
1.直线Y=MX+N与Y=2X+1相交于(2,B),与Y=-X+2相交于(A,1)求M,N值
与Y=2X+1相交于(2,B),代入,B=2*2+1=5,B=5,
与Y=-X+2相交于(A,1)带入,1=-A+2,A=1,
就是直线Y=MX+N 经过 (2,5) ,(1,1)
5=M*2+N,
1=M*1+N
5-1=2M+N-1M-N,
4=M
1=4+N,N=-3,
2.当K为何值时,函数Y=2-X,Y=-X/3+4,Y=4/K X-3