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There is a diagram with two vectors \(\vvec=twovec21\) and \(\wvec=\twovec12\) shown. There is also a grid consisting of two sets of parallel lines. One set of parallel lines is parallel to \(\vvec\) and passes through integer multiples of \(\wvec\text{.}\) The other set of parallel lines is parallel to \(\wvec\) and passes through integer multiples of \(\vvec\text{.}\)
At the top of the diagram are two sliders, which allow the reader to vary two scalars \(c\) and \(d\text{.}\) The linear combination \(c\vvec+d\wvec\) is also shown. When either of the two sliders is changed, the new linear combination is shown.

Instructions.

In a similar way, the diagram below can be used to construct linear combinations
\begin{equation*} c\vvec + d\wvec. \end{equation*}