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You are here: Home / Quant Questions / Geometry / Coordinate Geometry DS – Slope of Lines

Coordinate Geometry DS – Slope of Lines

February 23, 2012 By K S Baskar Leave a Comment

Here is a data sufficiency question from Coordinate geometry. 
Is the slope ‘m’ of the line y = mx + c positive?
1. The x and y intercepts are both negative.
2. The line passes through the first quadrant.
Correct Answer : Choice A. Statement 1 alone is sufficient.
Explanatory Answer
Positive Sloping Lines : The x and y intercepts of the line are of opposite signs. If the x intercept is positive, the y intercept will be negative. Conversely if the y intercept is positive, the x intercept will be negative.
 Negative Sloping Lines : The x and y intercept will be of the same sign. If the x intercept is positive, the y intercept will also be positive. If the x intercept is negative, the y intercept will also be negative.
Statement 1 : x and y intercepts are both negative. The line has to be a negative sloping line. So, we can answer from statement 1 that the line is not positive sloping. 
Statement 1 is sufficient. Choice A or Choice D is the answer.
Statement 2: The line passes through the first quadrant. Knowing only one of the quadrants through which a line passes we will not be able to determine whether it is positive sloping. Statement 2 is not sufficient.
As statement 1 alone is sufficient, while statement 2 is not choice A is the correct answer.

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Filed Under: Geometry Tagged With: GMAT Coordinate Geometry, GMAT Data Sufficiency, GMAT DS, Lines, Slopes

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