Michael graphs the equations y= -1/2+4 and y = x + 1 to solve the equation -1/2x+4= x+1. His graph is shown below. What are the solution(s) of -1/2x+4= x+1?
A. –1 and 8
B. 1 and 4
C. 2
D. 3

Kelli swam upstream for some distance in a hour. she then swam downstream the same river for the same distance in only 6 minutes. if the river flows at 5km/hr, how fast can kelli swim in still water?