coordinate geometry question from powerprep

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shrutib: Senior | Next Rank: 100 Posts; Posts: 41; Joined: Wed May 30, 2012 5:21 am; Thanked: 3 times

by shrutib » Wed May 30, 2012 7:14 am

In the coordinate plane line l and line k intersect at point (4,3)is the product of their slopes negative?

1. the product of x intercepts of line l and k is positive.

2. the product of y intercepts of l and k is negative.

I got the answer right, but want to see the approach. Thank you.

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Source: Beat The GMAT — Data Sufficiency | Wed May 30, 2012 7:14 am

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Mike@Magoosh: GMAT Instructor; Posts: 768; Joined: Wed Dec 28, 2011 4:18 pmFollowed by: 140 members; Location: Berkeley, CA; Thanked: 387 times

by Mike@Magoosh » Wed May 30, 2012 9:28 am

Hi, there. I'm happy to help with this.

This was an intensely visual explanation, so I created a pdf with all the images.

Here's another DS question about slopes, for further practice.
https://gmat.magoosh.com/questions/1026
When you submit your answer, the following page will have the video explanation.

I hope all this helps. Let me know if you have any further questions.

Mike

Attachments

DS about slopes of lines.pdf: (189.18 KiB) Downloaded 116 times

Magoosh GMAT Instructor
https://gmat.magoosh.com/

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1947: Master | Next Rank: 500 Posts; Posts: 215; Joined: Sat Jun 14, 2008 4:24 pmFollowed by: 1 member; Thanked: 13 times

by 1947 » Wed May 30, 2012 9:45 am

Thanks for the explaination Mike...but the link does not open the practice question

If my post helped you- let me know by pushing the thanks button. Thanks

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GMAT/MBA Expert

Mike@Magoosh: GMAT Instructor; Posts: 768; Joined: Wed Dec 28, 2011 4:18 pmFollowed by: 140 members; Location: Berkeley, CA; Thanked: 387 times

by Mike@Magoosh » Wed May 30, 2012 12:25 pm

1947 wrote:Thanks for the explaination Mike...but the link does not open the practice question

I'm sorry --- I didn't activate the link. I just activated it, so it should work now. Sorry about the delay!

Mike

Magoosh GMAT Instructor
https://gmat.magoosh.com/

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