A steamboat travels upstream, against the current, at a speed of 9 miles per hour. Later, the steamboat travels downstream, with the current, at a speed of 17 miles per hour. Choose the system of equations that can be solved to find the speed of the steamboat, x, and the speed of the current, y.
1) {x - y = 9, y = 17}
2) {x = 9, y - x = 17}
3) {x - y = 6, y = 26}
4) {x - y = 26, y = 6}
