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2) Two lines K, L meet at point ( 1,1 ). Is K's interception

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CEO
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2) Two lines K, L meet at point ( 1,1 ). Is K's interception [#permalink] New post 01 Oct 2003, 14:00
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2) Two lines K, L meet at point ( 1,1 ). Is K's interception on Y >
L's?

A K's slope > L's slope
B L's slope < 0


3)A book store, soft cover's price is $2/copy, hardcover's price is
$5/copy. one day, 50 copies are sold, and the number of hardcover
sold is no less than 20, but no more than 30. How much money S generated from the sales?

1) 40<= S <=80
2) 120 <= S <= 210
3) 180 <= S <= 240.
SVP
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 [#permalink] New post 03 Oct 2003, 04:26
30>=HC>=20

consider the extreme cases
(1) HC=30, SC=20 S=30*5+20*2=150+40=190
(2) HC=20, SC=30 S=20*5+30*2=100+60=160

so, 160<=S<=190

(2) includes this interval.
Intern
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 [#permalink] New post 01 Nov 2003, 14:08
stol,for the first one you say A.can you explain.
slope = change in y / change in x.

y1/x1 > y2 /x2..... it can be that y2 > y1 then it will be A,if the X varies,then how can it be A?
just thinking loud, statement should be insuff.
Intern
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Joined: 13 Sep 2003
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 [#permalink] New post 01 Nov 2003, 14:12
agree with the second one.

160<=S<= 190..
  [#permalink] 01 Nov 2003, 14:12
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2) Two lines K, L meet at point ( 1,1 ). Is K's interception

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