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In the diagram, the line connecting A and B has slope of -2 and the y- [#permalink]
Bunuel wrote:
In the diagram, the line connecting A and B has slope of -2 and the y-coordinate of A is a positive number. Is the area of the triangle created by the points A, B, and O greater than 25 ?

(1) The x-coordinate of B is less than 7.
(2) The y-coordinate of A is greater than 11.

Attachment:
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Attachment:
Area.png
Area.png [ 9.11 KiB | Viewed 1069 times ]

\(\frac{y_2 - y_1}{x_2 - x_1 } =-2 \)

From the fig. we can see \(x_1 =0\) and \(y_2=0 \)

Thus we get \(=\frac{- y_1}{x_2} =-2\) thus \(y_1 = 2 x_2\)...(i)

We need to know whether:

\(\frac{1}{2}*x_2 *y_1 >25\) or \( x_2*y_1 > 50\) ...(ii)

or \((x_2 )^2 > 25 \)...(iii): substituing \(y_1\) from (i) into (ii)

or \((y_1)^2 > 100\)...(iv): substituing \(x_2\) from (i) into (ii)

(1) The x-coordinate of B is less than 7

So \(x_2 <7\)

Using (iii):

If \(x_2 =6\), we can answer yes
If \(x_2 \leq 5\), we can answer no

INSUFF.

(2) The y-coordinate of A is greater than 11.

so \(y_1 >11 \)

using (iv) we can definitely answer YES to the stem.

SUFF.

Ans B

Hope it helps.
GMAT Club Bot
In the diagram, the line connecting A and B has slope of -2 and the y- [#permalink]
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