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Co-ordinate geom

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Co-ordinate geom

by kris610 » Sun Aug 02, 2009 4:02 pm
Lines A and B intersect at (16/5,12/5). What is the slope of line B?

A) One of the angles formed at the pt of intersection is 90 deg.

B) Line A passes through the origin.
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by shahdevine » Sun Aug 02, 2009 6:11 pm
this is prolly e.

given: point on coordinate graph where lines a and b intersect. (16/5,12/5)
need: slope or m of line b

y=mx+b
16/5=m(12/5)+b

statement 1)

tells me angles formed are right angles but no m. insufficient

statement 2)

tells me line a passes through origin. I could get slope of line a with this info, but not line b.

combined.

still nothing. i don't have y-intercept for line b.

E

plz confirm.
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by kris610 » Sun Aug 02, 2009 6:41 pm
Shah,
No, you need to take a closer look.
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by adityanarula » Sun Aug 02, 2009 8:02 pm
IMO C

Stmnt 1: tells us that the product of the slopes is -1
Stmnt 2: we can determine slope of line A

Both together will be sufficient
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by kris610 » Mon Aug 03, 2009 3:01 am
OA is C.
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