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$\frac{5-9}{3-7}=\frac{0 + 2}{-5 - x}$
x= -7
$a=\begin{pmatrix}
4 \\
4 \\
\end{pmatrix}$ $b=\begin{pmatrix}
x + 5 \\
-2 \\
\end{pmatrix}$
k = -2
-2(x + 5) = 4
x = -7
raphael answered the question on January 16, 2017 at 06:22
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