Suppose rm(3, -4) = (1,1) and rm (1,1) = (-5,16). is m||n? explain

In geometry, the lines are parallel when their slopes are equal. The slopes can be calculated through the equation,
                                          m = (y2 - y1)/(x2 - x1)
Substituting,
                                          m = (1 - 3)/(1 --4) = -2/5
                                           m = (1 --5)/(1--16) = 6/17 
which are not the same. The answer is no.