Oplossing week 12
\(
\eqalign{
& a = \frac{{1 - - 8}}
{{13 - 19}} = \frac{9}
{{ - 6}} = - 1\frac{1}
{2} \cr
& y = - 1\frac{1}
{2}\left( {x - 9} \right) + c \cr
& 1 = - 1\frac{1}
{2}\left( {13 - 9} \right) + c \cr
& c = 7 \cr}
\)
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