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GMAT Prep Inequality PS

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Senior Manager
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GMAT Prep Inequality PS [#permalink] New post 21 Apr 2007, 08:53
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A
B
C
D
E

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(N/A)

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50% (00:00) correct 50% (00:00) wrong based on 2 sessions
Can someone explain how the following question would be solved?

Question: All points (x,y) that lie below the line l, shown above, satisfy which of the following inequalities?
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 [#permalink] New post 21 Apr 2007, 09:45
Using the y = mx + b formula for a line. First fill in the forumla for the line l displayed. slope = -3/6 and y-intercept is 3.

So line l is y = (-3/6)x + 3. Now form the inequality to represent all points below that line.
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 [#permalink] New post 24 Apr 2007, 17:08
An easier solution is:

If you put x = 6, only the last option gives y = 0. So, E is the answer
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 [#permalink] New post 24 Apr 2007, 19:08
Eqn of line: y = mx+c

c = 3, m = -1/2

so y = -x/2 + 3

Everything point that lines below the line must be y < -x/2 +3

(a side-note: every point that lies above the line must be y > -x/2+3)
  [#permalink] 24 Apr 2007, 19:08
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GMAT Prep Inequality PS

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