Posted by **jackie** on Saturday, September 11, 2010 at 12:55am.

Is the following pair of lines paralle or perpendicular? Prove the answer.

2y-x=2

y+2x=4

I think that the lines are perpendicular but do not know how to work the problem.

x=6/5 y=8/5 Can some one show me how to work this equation?

- algebra -
**drwls**, Saturday, September 11, 2010 at 1:37am
x=6/5 y=8/5 are the coordinates of the intersection point, but that does not tell you if the lines are perpendular or not.

The slope of the first line is 1/2.

The slope of the second line is -2.

Because the product of the slopes is -1, they are perpendicular.

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