z(x)=ax+b
z(0)=b
z(0)=d(0)=0-1=-1
b=-1
z(2)=0
0=a*2-1 a=1/2=0.5
z(x)=0.5*x-1
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Verified answer
z(x)=ax+b
z(0)=b
z(0)=d(0)=0-1=-1
b=-1
z(2)=0
0=a*2-1 a=1/2=0.5
z(x)=0.5*x-1