$2\mathrm{.}25$ An engineer wants to develop mathematical models for two mechanical springs. She loads the springs $($in tension and compression$),$ measures their static deflections, and compiles the results in Table P$2\mathrm{.}25.$ Use MATLAB's polyfit command to determine spring$-$force modeling equations for each spring. Plot both spring$-$model equations for deflections ranging from $-8$ to $8$ mm and include the data points from Table $P_2\mathrm{.}25$ on your plot. Comment on whether the springs exhibit linear or nonlinear relationships.

TABLE P$2\mathrm{.}25$

$\backslash$table$[[$Load force $($N$),$Spring #$1$ deflection $($mm$),$Spring #$2$ deflection $($mm$)],[0,0,0],[10,1\mathrm{.}2482,1\mathrm{.}1682],[15,1\mathrm{.}8822,1\mathrm{.}7523],[25,3\mathrm{.}1938,2\mathrm{.}9206],[35,4\mathrm{.}6099,4\mathrm{.}0888],[45,6\mathrm{.}2354,5\mathrm{.}2570],[50,7\mathrm{.}2055,5\mathrm{.}8411],[-10,-1\mathrm{.}2482,-1\mathrm{.}1682],[-15,-1\mathrm{.}8822,-1\mathrm{.}7523],[-25,-3\mathrm{.}1938,-2\mathrm{.}9206],[-35,-4\mathrm{.}6099,-4\mathrm{.}0888],[-45,-6\mathrm{.}2354,-5\mathrm{.}2570],[-50,-7\mathrm{.}2055,-5\mathrm{.}8411]]$

I really need help with this!