Posted by Anonymous on Saturday, October 24, 2009 at 4:14pm.
are these two lines perpendicular?
x+2y=5
2x+4y=7
How do I determine if these two are perpendicular?

math  Anonymous, Saturday, October 24, 2009 at 4:18pm
it is not perpendicular is this correct?

math  jim, Saturday, October 24, 2009 at 4:53pm
Correct!
Perpendicular lines have slopes that are negative reciprocals of each other.
Thus perpendiculars of
y = (1/2)x + anything
will have a form like
y = 2 + something
The two lines you specified are in fact parallel, because they have the same slope : (y = x/2 + something)

math  Anonymous, Saturday, October 24, 2009 at 4:57pm
thanks Jim
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