Find the equation of a straight line on which the perpendicular from the origin makes an angle of $45^{\large\circ}$ with x-axis and which forms a triangle of area 18 sq.units with the coordinate axes

Question

$\begin{array}{1 1}(a)\;2y+3x=6\\(b)\;y+x=6\\(c)\;2y+x=6\\(d)\;y+x=3\end{array}$