Đáp án + giải thích các bước giải:
`y=3x+2`
\begin{array}{|c|c|c|}\hline x&0&\dfrac{-2}{3}\\\hline y=2x+3&3&0\\\hline \end{array}
`y=-2x+1`
\begin{array}{|c|c|c|}\hline x&0&\dfrac{1}{2}\\\hline y=-2x+1&1&0\\\hline \end{array}
`y=1-x`
`->y=-x+1`
\begin{array}{|c|c|c|}\hline x&0&1\\\hline y=-x+1&1&0\\\hline \end{array}
`y=-2x`
\begin{array}{|c|c|c|}\hline x&0&1\\\hline y=-2x&0&-2\\\hline \end{array}
