CIRCLES 4

AIEEE 2015 Preparation › Co-ordinate Geometry questions › CIRCLES 4

A piece of cheese is located at (12,10) in a co-ordinate plane. A mouse is at (4,-2) and is running up the line y= -5x + 18. At the point (a,b) the mouse starts getting farther from the cheese rather than closer to it. The value of (a+b) is :
A) 6
B) 10
C)18
D) 14

Ans: B

#Mathematics #Co-ordinate Geometry

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1 Answers

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akari ·2010-02-04 09:08:22

slope from cheese * slope of line=-1
(b-10)5=a-12
5b-50=a-12
5b-a=38
also
b=-5a+18
5b-50=-25a + 40=a-12=> 26a=52
=>a=2
b=8

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