Why not type in the regular way like you did here ?
http://www.jiskha.com/display.cgi?id=1486616450
I can't read your post the way it was typed.
Find the $2 \times 2$ matrix $\bold{A}$ such that
\[\bold{A} \begin{pmatrix} 1 \\ 0 \end{pmatrix} = \begin{pmatrix} 1 \\ 2 \end{pmatrix}\]
and
\[\bold{A} \begin{pmatrix} 0 \\ 1 \end{pmatrix} = \begin{pmatrix} -7 \\ 4 \end{pmatrix}.\]
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