## Algebra 1: Common Core (15th Edition)

Let x = the person's speed in still water and let y = the speed of the current We have the system: $x-y=4$ $x+y=7$ Use elimination to solve for x. $2x=11$ $x=5.5$ $\rightarrow y=1.5$ The person's speed in still water is 5.5 mi/h, and the current speed is 1.5 mi/h.