GMATPrep 6;12;15;34

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castorpollux: Newbie | Next Rank: 10 Posts; Posts: 4; Joined: Thu Dec 20, 2007 5:59 pm

by castorpollux » Thu Feb 07, 2008 6:26 pm

Could some please help me with these?

thanks so much

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Source: Beat The GMAT — Problem Solving | Thu Feb 07, 2008 6:26 pm

Saffa: Senior | Next Rank: 100 Posts; Posts: 41; Joined: Thu Jul 12, 2007 1:16 am; Location: Cape Town South Africa; Thanked: 5 times

by Saffa » Fri Feb 08, 2008 3:43 am

Brief explanation of 1

Not to sure about 4

Apologies for handwriting

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castorpollux: Newbie | Next Rank: 10 Posts; Posts: 4; Joined: Thu Dec 20, 2007 5:59 pm

by castorpollux » Fri Feb 08, 2008 9:52 am

thanks a lot! im still not clear on #6 though.

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Saffa: Senior | Next Rank: 100 Posts; Posts: 41; Joined: Thu Jul 12, 2007 1:16 am; Location: Cape Town South Africa; Thanked: 5 times

by Saffa » Sun Feb 10, 2008 11:06 pm

Let me give it another go.

It is a Yes/No Question.

(1) Not Suff: If the lines' equation is x = 6 then it will never intersect the sircle (thus NO) but if the line has a slope of say 8 and went through x = 1.02, it will surely intersect the sircle (thus YES).

(2) Not Suff: They say nothing of where it intersects any of the axis so it might go through the xy planes somewhere in the millions (not close to the sircle and thus NO) or it can go right through the origin (thus YES).

Together we have the same issue. You can find a line with x- intercept greater than 1 and slope = -1/10 that will go through the sircle (y = -1/10 x + 0.5) and you can find a line that will not go through the sircle (y = -1/10 x + 10) So it is impossible to answer YES or NO to this question

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