Find the point ( x , y ) (x,y)

Algebra Level pending

Find the point ( x , y ) (x,y) on y = e x y = e^x such that y = e x y = e^x is nearest to x y = 5 x-y=5 .

( 3 , 6 ) (3,6) ( 0 , 1 ) (0,1) ( 1 , 1 ) (1,1) ( 2 , 2 ) (2,2)

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3 solutions

Mahdi Raza
Jun 15, 2020

The slope of the line x y = 5 x-y=5 can be translated with varying slopes. The point ( 0 , 1 ) (0,1) is closest to the graph at y = e x y = e^{x}

Pop Wong
Jun 16, 2020

Find the point (x,y) on y = e x y = e^x s.t. .....

Among the 4 options, i only got (0,1) is on the curve. :)

The distance of the point ( h , e h ) (h, e^h) on the curve y = e x y=e^x from the line x y = 5 x-y=5 is

h e h 5 2 |\frac{h-e^h-5}{\sqrt 2 }|

This distance will be minimum when e h 1 = 0 h = 0 , e h = 1 e^h-1=0\implies h=0,e^h=1 . So the required point is ( 0 , 1 ) \boxed {(0,1)} .

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