Bring (1, 6) into the above formula and get k = 6.

So y = 6t ≦ 0 ≦ t ≦.

1﹚

Let y' = k' t ﹢ b ﹙ 1 < t ≦ 10 ﹚.

Substitute ﹙ 1,6﹚, ﹙ 10,0﹚ into the above formula.

kˊ+b=6①

10k'+b=0②

From ① ②, k =-2/3, b = 20/3,

Therefore, y ˊ =-2/3t+20/3 ~1< t ≦10 ~

∴y=6t﹙0≦t≦ 1﹚④,y=-2/3t+20/3﹙ 1