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100 points for $49 worth of Veritas practice GMATs FREE VERITAS PRACTICE GMAT EXAMS Earn 10 Points Per Post Earn 10 Points Per Thanks Earn 10 Points Per Upvote ## In the xy-plane a circle C has (0,0) as its center and 5 as tagged by: Max@Math Revolution ##### This topic has 1 expert reply and 0 member replies ### GMAT/MBA Expert ## In the xy-plane a circle C has (0,0) as its center and 5 as ## Timer 00:00 ## Your Answer A B C D E ## Global Stats Difficult [GMAT math practice question] In the xy-plane a circle C has (0,0) as its center and 5 as its radius. If line K is tangent to the circle C, what is the equation of line K? 1) Line K is tangent to the circle C at the point (0,5) 2) Line K passes through the point (5,5). _________________ Math Revolution Finish GMAT Quant Section with 10 minutes to spare. The one-and-only Worldâ€™s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. Only$149 for 3 month Online Course
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Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution.

The first step of the VA (Variable Approach) method is to modify the original condition and the question. We then recheck the question.

If a line is tangent to a circle at a point on the circle, the line is uniquely determined. Thus, condition 1) is sufficient.

Since (5,5) is outside the circle, there are two tangents to the circle passing through this point.
Thus, condition 2) is not sufficient.

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