已知y+3与x-4成反比例,且x=1时,y=4.
则设 y+3=k/(x-4)带入x=1,y=4得
7=k/(-3)
则
k=-21
则
y+3=-21/(x-4)
y=-21/(x-4) -3
当x=7时
y=-21/(x-4) -3=-21/3 -3=-7-3=-10
已知y+3与x-4成反比例,且x=1时,y=4.
则设 y+3=k/(x-4)带入x=1,y=4得
7=k/(-3)
则
k=-21
则
y+3=-21/(x-4)
y=-21/(x-4) -3
当x=7时
y=-21/(x-4) -3=-21/3 -3=-7-3=-10