Slope of the line represented by the parametric equations , -LSB- math -RSB- x = 2t +1 -LSB- / math -RSB- and -LSB- math -RSB- y = t-1 -LSB- / math -RSB- is ?
A line represented by -LSB- math -RSB- y = 3x − 1 -LSB- / math -RSB- and a line perpendicular to it intersect at -LSB- math -RSB- R -LRB- 1 , 2 -RRB- -LSB- / math -RSB- . What is the equation of the perpendicular line ?