Posted by **Donna** on Tuesday, February 8, 2011 at 7:46pm.

I need toIs the following pair of lines parallel or perpendicular? Prove your answer.

2y – x = 2

y + 2x = 4

can you explain how to break this down ...

- Algebra -
**hw**, Tuesday, February 8, 2011 at 8:05pm
you need to get it into slope intercept form--y=mx+b

(m being the slope) to figure out whether they are parallel (having equal slopes) or perpendicular (slopes are negative reciprocals)

2y-x=2

2y=x+2

y=1/2x+1

slope=1/2

y+2x=4

y=-2x+4

slope=-2

-2 and 1/2 are negative reciprocals making these two line perpendicular

- Algebra -
**Donna**, Tuesday, February 8, 2011 at 8:28pm
Thank you I did not see the answer. Thank you so much

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