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Let point (2,1) be A and (5,2) be B......... First find the equation of AB..... which i hope u can easily find.
After that the slope of the so called mirror will be -3 as mirror is always perpendicular to the image.........
After that find the midpoint of AB..........For sure this point wil lie on the mirror........Now u got slope and a point.....
its easy to find the equation now....... the answer will be 6x+2y-24=0
Mid Point Of (2,1) and (5,2) is (7/2,3/2)
Slope of line joining (2,1) and (5,2) : 1/3
Slope of mirror line : -3
Equation of mirror line: [y-3/2]/[x-7/2]=-3
(2y-3)/(2x-7)=-3
2y-3=21-6x
2y+6x-24=0
y+3x-8=0
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