9. sales tax is 7.596. how much did tammy's lunch cost before tax if the tax on it was $0.727 define a variable and write an equation. solve the
equation and check your solution.

Cost of Tammy's lunch box before tax = $9.571

Step-by-step explanation:

Let the cost of Tammy's lunch box before tax be =$

Sales tax charged = $0.727

Sales tax rate =7.596%

Sales tax charged in terms of  will be = 7.596% of the Original cost of lunch box

So, we have,

Dividing both sides by

∴

∴ Cost of Tammy's lunch box before tax = $9.571

- (2, -7)

- lines r and s and lines t and u must be parallel