i am stuck about drawing 6 linear functions in one graph which are

* f\_1(x)= 18x-9
* f\_2(x)= -17x+8
* f\_3(x)= -12x+6
* f\_4(x)= 4x-2
* f\_5(x)= -3x+1
* f\_6(x)= (\Pi /2)x

f\_i : [0,1]-> R where i=1,2,..6 .Thanks in advance

So far I rearrange my code as 

```
\begin{tikzpicture}%[scale=1.0]
    \begin{axis}[
width=10cm,
xlabel=$x$, ylabel=$\varphi_{i}(x)$,
ymin=-10,axis on top=true,
axis x line=middle,
axis y line=middle, 
grid=major,
legend pos=outer north east
                    ]
\addplot [blue, line width = 1, smooth, domain=0:1] {18*x-9};
\addplot [red, line width=1,smooth,domain=0:1] {-17*x +8};
\addplot [yellow, line width=1,smooth,domain=0:1] {-12*x+6};
\addplot [green, line width=1,smooth,domain=0:1] {4*x-2};
\addplot [pink, line width=1,smooth,domain=0:1] {-3*x+1};
\addplot [orange, line width=1,smooth,domain=0:1] {(3/2) *x};

\node [fill=black, circle, scale=0.3] at (axis cs: {10/21},{-3/7}) {};
\node [fill=black, circle, scale=0.3] at (axis cs: {1/2},{-1/2}) {};
\node [below left] at (axis cs: {1/2},{-1/2}) {$\frac{10}{21},\frac{-3}{7}$};
\node [below right] at (axis cs: {1/2},{-1/2}) {$(\frac{1}{2},\frac{-1}{2}$};

\legend  {$\varphi_1 (x)=18 x - 9$,
          $\varphi _2 (x)=-17x+8$,
          $\varphi_3 (x)=-12x+6$,
          $\varphi_4 (x)=4x-2$,
          $\varphi_5 (x)=-3x+1$,
          $\varphi_6 (x)=x{\displaystyle\pi/2}$
         };
    \end{axis}
\end{tikzpicture}

```

but i have problems in put name on intersection point. they are not look good as much as i think :)