matplotlib add legend axis x

1fig = plt.figure(figsize=(10,5))
2ax = fig.add_subplot(111)
3ax.set_title('ADR vs Rating (CS:GO)')
4ax.scatter(x=data[:,0],y=data[:,1],label='Data')
5plt.plot(data[:,0], m*data[:,0] + b,color='red',label='Our Fitting 
6Line')
7ax.set_xlabel('ADR')
8ax.set_ylabel('Rating')
9ax.legend(loc='best')
10plt.show()