exam Maths Puzzle Numerical Ability

Find the equation for the asymtopes of the hyperbola x^2/9 - y^2/81 = 1

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exam Other Question

Find the inverse of the relation {(4,2),(-1,5),(2,3)} Please! A coffee merchant has coffee beans that sell for $9 per pound and $12 per pound. The two types are to be mixed to create 100lb. of a mixture that will sell for $11.25 per pound. How many of each type of bean should be used in the mixture?