The Fit command returns the least-squares fit for a specified list of data as a linear combination.

$\mathrm{with}\left(\mathrm{MmaTranslator}\left[\mathrm{Mma}\right]\right)\:$

$\mathrm{Fit}\left(\left[\left[0\,2\right]\,\left[3\,5\right]\,\left[5\,8\right]\,\left[8\,11\right]\right]\,x+5\,x\right)$

$\frac{273x}{358}+\frac{1365}{358}$

$\mathrm{with}\left(\mathrm{MmaTranslator}\right)\:$

$\mathrm{FromMma}\left(\mathrm{`Fit[\{\{0,\; 2\},\; \{3,\; 5\},\; \{5,\; 8\},\; \{8,\; 11\}\},\; x+5,\; x]`}\,\mathrm{evaluate}\right)$

$\frac{273x}{358}+\frac{1365}{358}$