The equation of the tangent to the curve at the point where it cuts the y - axis is
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I have not done this concept yet in my school or either but i used a bit reasoning to solve it...For example, it says that the graph intersects the y-axis, so at y-axis the value of x=0. Putting that in the equation, we turn up with y=b. Now checking all the options only one is where x/a=0 (as x=0) and y/b=1(as y=b). Therefore, x/a+y/b=1.
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