a person bikes 2 1/2 miles at constant rate in 1/8 of an hour what distance , in miles , does the person bike in an hour

The person bike 20 miles in an hour.

Step-by-step explanation:

Given: At a constant speed, a person travels miles in hour.

As

So, in hour, distance traveled = miles

As time and distance are proportional, Multiply 8 om both sides , we get  

In 1 hour, distance traveled = miles

miles= 20 miles

Hence, the person bike 20 miles in an hour.

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

answer: y=4000x+14000

step-by-step explanation: