If T maps $\displaystyle \vec x$ into $\displaystyle \vec w$, and the standard matrix is defined by the equations:

$\displaystyle w_1=2x_1-3x_2+x_3$

$\displaystyle w_2=3x_1+5x_2-x_3$

How do I find the standard matrix? And then how do I find the image of vectors under T by substituting in the equations and using the standard matrix?

The prof didn't go over any of this stuff, and yet still assigned one question as homework, and unfortunately the text is rather vague...