a, Khi \(m=-1\Rightarrow y=-2x+2\)
b, Ta có: \(d ∩ Ox\) \(=A\left(-\frac{2}{m-1},0\right),\) \(d∩Oy=B(0,2)\)
Để \(\Delta OAB\) vuông cân:
\(\Rightarrow OA=OB\Rightarrow|-\frac{2}{m-1}|=|2|\)
\(\Rightarrow|\frac{2}{m-1}|=2\)
\(\Rightarrow|m-1|=1\)
\(\Rightarrow m-1=1\)
\(\Rightarrow m=2\)
Hoặc: \(m-1=-1\)
\(\Rightarrow m=0\)