9.Straight Line
easy

બિંદુઓ $(1, 3)$ અને $(5, 1)$ એ લંબચોરસના સામસામેના શિરોબિંદુઓ છે.જો બાકીના બે શિરોબિંદુઓ રેખા $y = 2x + c,$ પર આવેલ હોય તો $c$ મેળવો.

A

$4$

B

$-4 $

C

$2$

D

$-2$

(IIT-1981)

Solution

(b) Let $ABCD$ be a rectangle. Given $A\, (1, 3)$ and $C\, (5, 1)$. Equation $B$ and $D$ lie on $y = 2x + c$

We know that intersecting point of diagonal of rectangle is same or at midpoint. So mid point of $AC$ is $(3, 2)$. So $y = 2x + c$ passes throguh $(3, 2)$. Hence $c = – 4$.

Standard 11
Mathematics

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