the slope of a perpendicular line = -

the equation of a line in slope-intercept form is
y = mx + c ( m is the slope and c the y-intercept )
rearrange 5x - 3y = 2 into this form
subtract 5x from both sides
- 3y = - 5x + 2 ( divide all terms by - 3 )
y =
x -

with slope m =

the slope of a line perpendicular = -
= -
