y+1=2z,z=k(x-1),x=-1,y=7代入得z=-2k,
y=2z-1=-4k-1=7,k=-2,y=2kx-2k-1=-4x+7
即,y=-4x+7
y+1=2z,z=K(x-1)
当x=-1,y=7时
z=4,K=-2
此时,z=-2(x-1)
y+1=2(-2(x-1))
y=3-4x
y+1=2z
设z=k(x-1)
x=-1时
z=-2k
y+1=2×(-2k)=-4k
y=-4k-1=7
4k=-8
k=-2
z=-2(x-1)
y+1=2z
y=2z-1
=-4(x-1)-1
=-4x+3
y+1=2z,设z=k(x-1)
x=-1,y=2(-2k)-1=7
k=-2
y=-4x+3
电风扇