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rational functions

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A rational function that passes through (0,0) and (4, 8/7) has the x-axis as a horiztonal asympotote. It also has 2 vertical asymptotes x=3, x=-3.

I understand that to set it up, it is

y= ax+b / (x+3)(x-3).

I don't understand how to solve for a and b.

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