Graph the equations to solve the system. y=1/3x-6 y=-1/3x-4 a) no solution: {} b) solutions: all numbers on the line c) one solution: {0,-2} d) one solution: {3,-5}

Steve wants to develop a way to find the total cost of any item including sales tax. the sales tax in his city is 6%. his friend jenna writes the expression x + 6x where x is the cost of the item. explain whether her expression is correct based on the situation.