Q.
The x-intercept of the tangent to a curve is equal to the coordinate of the point of contact. The equation of the curve through the point (1,1) is
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a
yex/y=e
b
xex/y=e
c
xey/x=e
d
yey/x=e
answer is A.
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Detailed Solution
equation of tangent Y−y=dydx(x−x) For X-intercept Y=0→x=x−ydxdy According to the question x−ydxdy=y→dydx=yx−y put y=Vx→xdvdx=v21−v→∫1−vv2dv=∫dxx⇒−1V−logV=logx+c⇒−x/y−logy+logx=logx+c⇒−xy=logy+c pass (1,1)⇒c=−1⇒y=e⋅e−x/y⇒ex/y=ey⇒yex/y=e
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