A laser is fired at a flat mirror.

The laser beam starts at the point (0,5) following the equation y = 5 - x/3 heading down to the right.
The mirror follows the equation y=x/2.

Find the equation for the path the beam takes after it hits the mirror.

The laser beam intersects the mirror at (6,3).  The reflected beam passes through a point perpendicular to point (12,6) on the mirror.

Out of time..I'll continue later