Given the transformation matrix M=(2101)M = \begin{pmatrix} 2 & 1 \\ 0 & 1 \end{pmatrix}M=(2011), what is the image of the line y=xy=xy=x?
y=0.5xy = 0.5xy=0.5x
y=xy = xy=x
y=2xy = 2xy=2x
y=0.33xy = 0.33xy=0.33x