math
posted by Anonymous .
are these two lines perpendicular?
x+2y=5
2x+4y=7
How do I determine if these two are perpendicular?

it is not perpendicular is this correct?

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) 
thanks Jim