Question

Question 1 The line L passes through the points (1, 2, 3) and (3, 2, 1). Which one of the following equations is not a vector equation for the line? \begin{pmatrix} x \ y \ z \end{pmatrix} = \begin{pmatrix} 3 \ 2 \ 1 \end{pmatrix} + s \begin{pmatrix} 1 \ 0 \ -1 \end{pmatrix} \begin{pmatrix} x \ y \ z \end{pmatrix} = \begin{pmatrix} 3 \ 2 \ 1 \end{pmatrix} + s \begin{pmatrix} -2 \ 0 \ 2 \end{pmatrix} \begin{pmatrix} x \ y \ z \end{pmatrix} = \begin{pmatrix} 1 \ 2 \ 3 \end{pmatrix} + s \begin{pmatrix} 2 \ 0 \ -2 \end{pmatrix} \begin{pmatrix} x \ y \ z \end{pmatrix} = \begin{pmatrix} 1 \ 2 \ 3 \end{pmatrix} + s \begin{pmatrix} 2 \ 1 \ -2 \end{pmatrix}

          Question 1
The line L passes through the points (1, 2, 3) and (3, 2, 1). Which one of the following equations is not a vector equation for the line?
\begin{pmatrix} x \ y \ z \end{pmatrix} = \begin{pmatrix} 3 \ 2 \ 1 \end{pmatrix} + s \begin{pmatrix} 1 \ 0 \ -1 \end{pmatrix}
\begin{pmatrix} x \ y \ z \end{pmatrix} = \begin{pmatrix} 3 \ 2 \ 1 \end{pmatrix} + s \begin{pmatrix} -2 \ 0 \ 2 \end{pmatrix}
\begin{pmatrix} x \ y \ z \end{pmatrix} = \begin{pmatrix} 1 \ 2 \ 3 \end{pmatrix} + s \begin{pmatrix} 2 \ 0 \ -2 \end{pmatrix}
\begin{pmatrix} x \ y \ z \end{pmatrix} = \begin{pmatrix} 1 \ 2 \ 3 \end{pmatrix} + s \begin{pmatrix} 2 \ 1 \ -2 \end{pmatrix}

Question 1
The line L passes through the points (1, 2, 3) and (3, 2, 1). Which one of the following equations is not a vector equation for the line?

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Added by Rebecca P.

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