y=4-2x hay xet chieu bien thien va ve do thi cua ham so tren
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\(\begin{array}{l} y = 4 - 2x = - 2x + 4\\ Co\,\,\,a = - 2 < 0\\ \Rightarrow hs\,\,NB\,\,\,tren\,\,\,R.\\ Do\,\,thi\,\,ham\,\,\,so\,\,cat\,\,Ox\,\,tai\,\,A\left( {2;\,\,0} \right)\,\,\,va\,\,\,cat\,\,\,Oy\,\,tai\,\,B\left( {0;\,\,4} \right).\\ Do\,\,thi\,\,ham\,\,so\,\,\,nhu\,\,hinh\,\,ve. \end{array}\)
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