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CEO
Joined: 15 Aug 2003
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2) Two lines K, L meet at point ( 1,1 ). Is K's interception [#permalink]
 01 Oct 2003, 15:00
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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.
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SVP
Joined: 03 Feb 2003
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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.
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Intern
Joined: 13 Sep 2003
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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.
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Intern
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agree with the second one.
160<=S<= 190..
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