Graph the equation in a graphing calculator or in the table in a regular calculator and look for the zero on the x axis and the y axis
3 apples weigh 1 lb.....so 1 apple would weigh 1/3 = 0.3 lbs
Answer:

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Substitute -2 in for x and get (9)^-2
Flip the equation so that the exponent is positive and get 1/9^2
Work it out 1/(9*9) = 1/81
You didn't share the price list of the items... but together they have $12.00