# Find the value of $m$ and $c$ if the straight line passes through the point $A(2,3)$ and $B(1,6)$.
$\begin{array}{1 1}(a)\;m=3,c=-9&(b)\;m=-3,c=9\\(c)\;m=4,c=8&(d)\;m=2,c=4\end{array}$