<PRE><B>Question 68476</B>
Determine which two equations represent perpendicular lines.

A y= 4/7x-3  B y= 3x-4/7  C y=-1/3x+4/7 D y= 1/3x-4/7

Perpendicular lines have slopes that are negative reciprocals of each other.  (That means that they have opposite signs and are upside down.)
When equations are in slope intercept form:  {{{highlight(y=mx+b)}}}, we know that the slope is m.
A {{{y=highlight(4/7)x-3}}} m=4/7
B {{{y=highlight(3)x-4/7}}} m=3
C {{{y=highlight(-1/3)x+4/7}}} m=-1/3
D {{{y=highlight(1/3)x-4/7}}} m=1/3
B and C have slopes that are opposite signs and reciprocals of each other, so they are perpendicular.
Happy Calculating!!!</PRE>