The given equation is
[tex]y=2x+10[/tex]If Line l is mapped onto line m then they are not parallel because the transformation is a dilation with a scale factor of 2/5.
We can find the equation for Line l, we just have to multiple Line m with 5/2, the inverse of the dilation.
[tex]\begin{gathered} y=\frac{5}{2}(2x+10) \\ y=5x+25 \end{gathered}[/tex]