Create a MATLAB script to generate and plot the following equations on the interval $4<=$x$<=4$:

$(1)$ y$=3$x$+2$

$(2)$ y$=$x$^3-4$x$^2+$x$+6($Cubic equation$)$

Plot these equations on the same graph, label the axes appropriately, provide a title for the graph, use different line styles and colors for each curve, and include a legend to distinguish between the equations.