4.3 Use a system of two linear equations to solve each exercise: 1) A company paid its' programmers $700 per week and its' code testers $450 per week. If thirty-five people were working on a project and the total weekly payroll was $20 ,750, how many of each skill were employed? 2) Jason is in charge of Word and Excel training at his company. He has a budget sufficient to do 115 hours of Word training and 170 hours of Excel training. He has found that experienced employees can learn Word in 3 hours and Excel in 4 hours. New hires can learn Word in 4 hours and Excel in 7 hours. How many of each class of employee can he afford to train ? 3) A small plane took an hour and 10 minutes to go 210 miles against the wind. On the return trip (with the wind) it only took 50 minutes. What was the air speed of the plane in still air