Determine if the equations represent parallel lines, perpendicular lines, or neither.
l1:y=2/9x+4
l2:y=-9/2x+3
1 answer
The equations represent perpendicular lines because the slopes of the two lines are negative reciprocals of each other. The slope of line 1 is 2/9 and the slope of line 2 is -9/2, which are negative reciprocals (-9/2 * 2/9 = -1).