\(y=\left(m-1\right)x\)
\(M\left(-1;2\right)\Rightarrow x=-1;y=2\)
\(2=\left(m-1\right)\cdot-1\)
\(2=-m+1\)
\(1=-m\)
\(m=-1\)
b.
\(y=\left(m-1\right)x\)
\(y=\left(-1-1\right)x\)
\(y=-2x\)
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