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Show that the line x/a+y/b=1 touches th...

Show that the line `x/a+y/b=1` touches the curve `y=b e^(-x/a)` at the point where it crosses the y-axis.

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Show that the line (x)/(a)+(y)/(b)=1 touches the curve y=be^(-(x)/(a)) at the point where it crosses the y-axis.

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