# How do you determine if the lines #-12x+9y=15# and #-4x+3y=5# are paralle , perpendicular or neither?

##### 1 Answer

Mar 27, 2015

I would look at the slope of the lines represented by these equations (it representes the inclination of the lines):

first write them isolating

1)

and

2)

The slope is the coeficient of

You can have:

1) same slope=parallel lines;

2)slope1=-1/slope2 =perpendicular lines;

3) slope1

In this case they are parallel (and coincident).