y = kx + b
把两个点的数据分别代入上式,
- 4k + b = 0
2k + b = 6
可解得,
6k = 6
k = 1
b = 4
函数为
y = x + 46k是怎么得来的？y = kx + b 把两个点的数据分别代入上式，- 4k + b = 0(1)2k + b = 6(2) (2)-(1)，得6k = 6k = 1b = 4 函数为y = x + 4