You want to buy a cd that costs $18.50. the sales-tax rate in your state is 4.5 percent. how much sales tax will you pay for this cd

Step-by-step explanation:

We need to analize the exercise.

We know that the sales-tax rate in your state is 4.5% and the cost of the CD is $18.50.

Then, let be "x" the the amount of sales tax you will pay for the CD.

You can write this expression:

Evaluating, you get that the value of "x" is:

a) y = -3x +2

b) y = 1/2x -6

these 2 can be combined into one equation.

-3x +2 = .5x -6

8 = 3.5x

x = 8 / 3.5 = 2.2857142857

y = -3 * (8 / 3.5) +2

y = (-24 / 3.5) + 2

y = -4.8571428571

step-by-step explanation:

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