Algebra 1
posted by Cynthia .
Determine which two equations represent perpendicular lines.
a).y=5/3x5
b).y=5x5/3
c).y=1/5x+5/3
d).y=1/5x5/3

perpenduclar lines have negative reciprocal slopes
y= 3x + 3
y= 1/3 x + 55 are perpendicular lines. 
Thanks