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# In the xy-plane, line l and line k intersect at the point

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In the xy-plane, line l and line k intersect at the point [#permalink]  05 Jan 2010, 08:00
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In the xy-plane, line l and line k intersect at the point (16/5, 12/5). What is the slope of line l?
(1) The product of the slopes of line l and line k is –1.
(2) Line k passes through the origin.
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Re: slope l [#permalink]  05 Jan 2010, 08:14
C..
si) gives us the relation in two lines ..the two r perpendicular to each other...not suff
sii) it gives us the 2nd pt on line k... we can find the slope of k from it but not l.. not suff.
combined frm k ,slope of l can be found frm reln in si..suff
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Re: slope l [#permalink]  05 Jan 2010, 12:03
Answer is C, Both of them together
Re: slope l   [#permalink] 05 Jan 2010, 12:03
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