y-1=kx
4-1=-2k
k=-3/2
y=-(3/2)x+1
-2=-(3/2)a+1 a=2
0≤x≤5
0≤(3/2)x≤15/2
-15/2≤-(3/2)x≤0
-13/2≤-(2/3)x+1≤1
-13/2≤y≤1(2)设品(a,-2)在这个图象上朮a(3)如果x的取值范围是大于等于0小于等于5求y的取值范围都写了啊