l. Solve: -7x+y = -l9 and -2x+3y = l9 by elimination. 2. A sofa was sold for $3574. The selling price included a 12% sales tax. How much was the cost of the bed before the tax? 3. Solve the system 163: -l0y = l0 and -8x -6y = 6 graphically. 4. The total enrollment in two classes is 170 students. One class has 15 more students than the other. How many students are enrolled in each class? Make a system of equations and solve the problem. 5. Solve the system by substitution : Sx+y = 9 and IDs-7y = -l8 6. Flying to Bowen Island with a tailwind, the plane averaged l60 knv'h. On the return trip the plane only averaged I I4 kmfh while ying back into the same wind. Find the speed of the wind and the speed of the plane in still air. 1'. Solve the system of equations by elimination: -7x+y = -19 and -2x+3y = -19 8. What percent of38 is 15? 9. John wants to pay off his student loan within the next 5 years, so he has increased his original weekly payment by 75%. His new payment is now $1500 per week. How much was the original payment? It). Solve for w: J = (Sw-Zy)f(?w-3c) l l. Caroline"s sales last week were $540 more than four times Tom's. Together they sold $5340. Determine how much each person sold last week? l2. Solve the system ofequations by elimination: 3x-2y = 2 and Sx-Sy = 10 13. $65 is 32% of what amount? l4. Solve by elimination: 5x+4y=l4 and 3x+6y=6 IS. Solve by graphing: y=3x-4 and y={-'/E}x+3