9173(a) A flat mirror is perpendicular to thexy-plane and stands on the
liney=x+4. A laser beam from the origin strikes the mirror at
P(− 1 ,3)and is reflected to the pointQon thex-axis. Determine
the coordinates of the pointQ.3(b) A flat mirror is perpendicular to thexy-plane and stands on a line
L. A laser beam from the origin strikes the mirror atP(− 1 ,5)and
is reflected to the pointQ(24,0). Determine the equation of the line
L.