Asked by jason

which two equations represent perpendicular lines:
y= 2x-9
y= 1/2x+9
y= -1/2x+9
y= 1/2-9
Answered by drwls
They are all in y = mx + b form.

m is the slope

Pick the two with the same slope.
Answered by jujube
do you mean two with opposite reciprocals? Because wouldn't two with the same slope be parallel?
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