pouvez vous m'aider svpp

[tex]f(x)=ax+b \\ x=0 =\ \textgreater \ f(x)=b=-4 \\ x=1 =\ \textgreater \ f(x)=a+b=-2 =\ \textgreater \ a=-2-b=2 \\ f(x)=2x-4. \\ g(x)=ax+b. \\ x=0 =\ \textgreater \ g(x)=b=-2 \\ x=-2 =\ \textgreater \ g(x)=-2a+b=4 =\ \textgreater \ a=(b-4)/2=-3 \\ g(x)=-3x-2.[/tex]