How to graph the demand curve, supply curve with tax and the supply curve without tax here? how to find the quantity and the price for each equation.

2.5 Taxes & Efficiency I [24 points] ' : Suppose the weekly demand for a certain good in thousands of units, is given by the -. equation P = 39 - 20, and the weekly supply curve of the good by the equation P = 7 + 2Q -. ' : where P is the price in dollars. Finally, suppose a per-unit tax of $28, to be collected from ' 3...? sellers is imposed in this market. Complete the following questions. - * ' ' : Note: If necessary round your answers to two decimal places. ' a) Graph the weekly demand, supply (pre-tax), and supply (posttax) equations