Answer: Constant = 11.5
y = 11.5x.
Step-by-step explanation:
This is direct variation so the equation of proportionality is
y = kx where y = miles, x = hours and k is a constant.
23 = 2k
k = 11.5
34.5 = 3k
k = 11.5
46 = 4k
k = 11.5
The equation is my= 11.5x.